src/bin/dhcp4/ctrl_dhcp4_srv.*
src/bin/dhcp6/ctrl_dhcp6_srv.*
    Changed dbReconnect() to accept ReconnectCtlPtr
    Added commentary for dbReconnect and dbLostCallback

src/lib/dhcpsrv/database_connection.h
    Removed extraneous typedef

many files:
    Changed DatabaseConnection::Callback to ::DbLostCallback

src/lib/dhcpsrv/tests/database_connection_unittest.cc
    Added commentary to text fixture and tests