[#1115] shutdown command exit-value arg, exit w/failure on db loss

Added exit-value argument to shutdown command.
kea-dhcpX servers now exit with EXIT_FAILURE status on db loss

src/lib/process/daemon.*
    Daemon::exit_value_,  new member with getter/setter

src/lib/process/d_controller.*
    DControllerBase::launch() - now returns getExitValue()
    DControllerBase::shutdownHandler() - uses exit-value argument to set exit
    value

src/lib/process/tests/daemon_unittest.cc
    TEST_F(DaemonTest, exitValue)  - new test

src/bin/agent/main.cc
    Use launch() return value for exit value.

src/bin/agent/tests/ca_controller_unittests.cc
    TEST_F(CtrlAgentControllerTest, shutdownExitValue)  - new test

src/bin/d2/main.cc
    Use launch() return value for exit value.

src/bin/d2/tests/d2_command_unittest.cc
    TEST_F(CtrlChannelD2Test, shutdownExitValue)  - new test

src/bin/dhcp4/ctrl_dhcp4_srv.*
    ControlledDhcpv4Srv::
        commandShutdownHandler() - handle exit-value argument
        shutdown(int exit_value) - added exit_value parameter
        dbReconnect() - call shutdown(EXIT_FAILURE)
        dbLostCallback() - call shutdown(EXIT_FAILURE)

src/bin/dhcp4/dhcp4_srv.*
    Dhcp4Srv::run() - returns int Daemon::exit_value instead of bool

src/bin/dhcp4/main.cc
    Use run() return value for exit value.

src/bin/dhcp4/tests/ctrl_dhcp4_srv_unittest.cc
    TEST_F(CtrlChannelDhcpv4SrvTest, commands) - revamped test

src/bin/dhcp6/ctrl_dhcp6_srv.*
    ControlledDhcpv6Srv::
        commandShutdownHandler() - use exit-value argument to set exit value
        shutdown(int exit_value) - added exit_value parameter
        dbReconnect() - call shutdown(EXIT_FAILURE)
        dbLostCallback() - call shutdown(EXIT_FAILURE)

src/bin/dhcp6/dhcp6_srv.*
    Dhcp6Srv::run() - returns int Daemon::exit_value instead of bool

src/bin/dhcp6/main.cc
    Use run() return value for exit value.

src/bin/dhcp6/tests/ctrl_dhcp6_srv_unittest.cc
    TEST_F(CtrlDhcpv6SrvTest, commands) - revamped test

1 files changed, 2 insertions, 2 deletions

diff --git a/src/bin/dhcp6/dhcp6_srv.cc b/src/bin/dhcp6/dhcp6_srv.cc
index 1f28dd4a12..5aa4321e39 100644
--- a/src/bin/dhcp6/dhcp6_srv.cc
+++ b/src/bin/dhcp6/dhcp6_srv.cc
@@ -442,7 +442,7 @@ Dhcpv6Srv::initContext(const Pkt6Ptr& pkt,
     evaluateClasses(pkt, true);
 }
 
-bool Dhcpv6Srv::run() {
+int Dhcpv6Srv::run() {
 #ifdef ENABLE_AFL
     // Set up structures needed for fuzzing.
     Fuzz fuzzer(6, server_port_);
@@ -475,7 +475,7 @@ bool Dhcpv6Srv::run() {
     // destroying the thread pool
     MultiThreadingMgr::instance().apply(false, 0);
 
-    return (true);
+    return (getExitValue());
 }
 
 void Dhcpv6Srv::run_one() {