[5046] Avoid wiping logging when config is empty

src/lib/dhcpsrv/srv_config.cc
    SrvConfig::applyLoggingCfg() - now only calls LoggerManager::process()
    if the logger config isn't empty

src/bin/dhcp6/ctrl_dhcp6_srv.cc
src/bin/dhcp6/tests/dhcp6_test_utils.cc
    Minor clean up and commentary

src/bin/dhcp6/kea_controller.cc
    configure(const std::string& file_name)
    - Removed initial rollback, now done in commandSetConfigHandler()

src/bin/dhcp6/tests/ctrl_dhcp6_srv_unittest.cc
   - Removed unnecessary call to initLogger

1 files changed, 1 insertions, 1 deletions

diff --git a/src/bin/dhcp6/tests/dhcp6_test_utils.cc b/src/bin/dhcp6/tests/dhcp6_test_utils.cc
index 5c4b70d30d..a1c74dab10 100644
--- a/src/bin/dhcp6/tests/dhcp6_test_utils.cc
+++ b/src/bin/dhcp6/tests/dhcp6_test_utils.cc
@@ -48,7 +48,7 @@ BaseServerTest::~BaseServerTest() {
     // Revert to original data directory.
     CfgMgr::instance().setDataDir(original_datadir_);
 
-    // Revert to unit test logging
+    // Revert to unit test logging in case the test reconfigured logging.
     isc::log::initLogger();
 }