[#260,!120] Packet queueing is now optional

src/bin/dhcp<4/6>/ctrl_dhcp<4/6>_srv.cc
    ControlledDhcpv<4/6>Srv::processConfig() - now calls
        IfaceMgr::configureDHCPPacketQueue

src/bin/dhcp<4/6>/dhcp<4/6>_parser.yy
    dhpc-queue-control parsing updated to enforce
    enable-queue/queue-type rules

src/bin/dhcp<4/6>/tests/config_parser_unittest.cc
    TEST_F(Dhcp<4/6>ParserTest, dhcpQueueControl)
    TEST_F(Dhcp<4/6>ParserTest, dhcpQueueControlInvalid)

src/lib/dhcp/iface_mgr.*
    IfaceMgr
    - closeSockets()  - now calls stopDHCPReceiver

    - openSockets<4/6>() -  now calls startDHCPReceiver

    - receive<4/6>Indirect() - new function which monitors receiver
    thread watch sockets, reads DHCP packets from queue

    - receive<4/6>Direct() - new function which monitors and reads DHCP
    packets from interface sockets directly

    - receive<4/6>() - rewritten to call receive<4/6>Indirect
    if receiver thread is running, otherwise it calls receive<4/6>Direct

    - configureDHCPPacketQueue() - new function which either enables queuing
    by creating a new packet queue, or disables it by destroying the
    existing queue

src/lib/dhcp/packet_queue_mgr.h
    PacketQueue::destroyPacketQueue() - new function

src/lib/dhcp/packet_queue_mgr<4/6>.cc
    PacketQueueMgr<4/6>::PacketQueueMgr<4/6>() - no longer creates a
    default packet queue

src/lib/dhcpsrv/cfg_iface.cc
    CfgIface::closeSockets() - removed call to stopDHCPReceiver
    CfgIface::openSockets() - removed call to startDHCPReceiver

src/lib/dhcpsrv/parsers/dhcp_queue_control_parser.*
    DHCPQueueControlParser
    - removed unused family_ member
    - parse() - added support for enable-queue

src/lib/dhcpsrv/tests/dhcp_queue_control_parser_unittest.cc
    - new file

1 files changed, 180 insertions, 12 deletions

diff --git a/src/bin/dhcp4/position.hh b/src/bin/dhcp4/position.hh
index 4a9a456ce0..c60fabbdf8 100644
--- a/src/bin/dhcp4/position.hh
+++ b/src/bin/dhcp4/position.hh
@@ -1,12 +1,180 @@
-// Generated 201811201411
-// A Bison parser, made by GNU Bison 3.2.1.
-
-// Starting with Bison 3.2, this file is useless: the structure it
-// used to define is now defined in "location.hh".
-//
-// To get rid of this file:
-// 1. add 'require "3.2"' (or newer) to your grammar file
-// 2. remove references to this file from your build system
-// 3. if you used to include it, include "location.hh" instead.
-
-#include "location.hh"
+// A Bison parser, made by GNU Bison 3.0.4.
+
+// Positions for Bison parsers in C++
+
+// Copyright (C) 2002-2015 Free Software Foundation, Inc.
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+// As a special exception, you may create a larger work that contains
+// part or all of the Bison parser skeleton and distribute that work
+// under terms of your choice, so long as that work isn't itself a
+// parser generator using the skeleton or a modified version thereof
+// as a parser skeleton.  Alternatively, if you modify or redistribute
+// the parser skeleton itself, you may (at your option) remove this
+// special exception, which will cause the skeleton and the resulting
+// Bison output files to be licensed under the GNU General Public
+// License without this special exception.
+
+// This special exception was added by the Free Software Foundation in
+// version 2.2 of Bison.
+
+/**
+ ** \file position.hh
+ ** Define the isc::dhcp::position class.
+ */
+
+#ifndef YY_PARSER4_POSITION_HH_INCLUDED
+# define YY_PARSER4_POSITION_HH_INCLUDED
+
+# include <algorithm> // std::max
+# include <iostream>
+# include <string>
+
+# ifndef YY_NULLPTR
+#  if defined __cplusplus && 201103L <= __cplusplus
+#   define YY_NULLPTR nullptr
+#  else
+#   define YY_NULLPTR 0
+#  endif
+# endif
+
+#line 14 "dhcp4_parser.yy" // location.cc:296
+namespace isc { namespace dhcp {
+#line 56 "position.hh" // location.cc:296
+  /// Abstract a position.
+  class position
+  {
+  public:
+    /// Construct a position.
+    explicit position (std::string* f = YY_NULLPTR,
+                       unsigned int l = 1u,
+                       unsigned int c = 1u)
+      : filename (f)
+      , line (l)
+      , column (c)
+    {
+    }
+
+
+    /// Initialization.
+    void initialize (std::string* fn = YY_NULLPTR,
+                     unsigned int l = 1u,
+                     unsigned int c = 1u)
+    {
+      filename = fn;
+      line = l;
+      column = c;
+    }
+
+    /** \name Line and Column related manipulators
+     ** \{ */
+    /// (line related) Advance to the COUNT next lines.
+    void lines (int count = 1)
+    {
+      if (count)
+        {
+          column = 1u;
+          line = add_ (line, count, 1);
+        }
+    }
+
+    /// (column related) Advance to the COUNT next columns.
+    void columns (int count = 1)
+    {
+      column = add_ (column, count, 1);
+    }
+    /** \} */
+
+    /// File name to which this position refers.
+    std::string* filename;
+    /// Current line number.
+    unsigned int line;
+    /// Current column number.
+    unsigned int column;
+
+  private:
+    /// Compute max(min, lhs+rhs) (provided min <= lhs).
+    static unsigned int add_ (unsigned int lhs, int rhs, unsigned int min)
+    {
+      return (0 < rhs || -static_cast<unsigned int>(rhs) < lhs
+              ? rhs + lhs
+              : min);
+    }
+  };
+
+  /// Add \a width columns, in place.
+  inline position&
+  operator+= (position& res, int width)
+  {
+    res.columns (width);
+    return res;
+  }
+
+  /// Add \a width columns.
+  inline position
+  operator+ (position res, int width)
+  {
+    return res += width;
+  }
+
+  /// Subtract \a width columns, in place.
+  inline position&
+  operator-= (position& res, int width)
+  {
+    return res += -width;
+  }
+
+  /// Subtract \a width columns.
+  inline position
+  operator- (position res, int width)
+  {
+    return res -= width;
+  }
+
+  /// Compare two position objects.
+  inline bool
+  operator== (const position& pos1, const position& pos2)
+  {
+    return (pos1.line == pos2.line
+            && pos1.column == pos2.column
+            && (pos1.filename == pos2.filename
+                || (pos1.filename && pos2.filename
+                    && *pos1.filename == *pos2.filename)));
+  }
+
+  /// Compare two position objects.
+  inline bool
+  operator!= (const position& pos1, const position& pos2)
+  {
+    return !(pos1 == pos2);
+  }
+
+  /** \brief Intercept output stream redirection.
+   ** \param ostr the destination output stream
+   ** \param pos a reference to the position to redirect
+   */
+  template <typename YYChar>
+  inline std::basic_ostream<YYChar>&
+  operator<< (std::basic_ostream<YYChar>& ostr, const position& pos)
+  {
+    if (pos.filename)
+      ostr << *pos.filename << ':';
+    return ostr << pos.line << '.' << pos.column;
+  }
+
+#line 14 "dhcp4_parser.yy" // location.cc:296
+} } // isc::dhcp
+#line 180 "position.hh" // location.cc:296
+#endif // !YY_PARSER4_POSITION_HH_INCLUDED