GitLab

 - lease_type_ renamed to pool_type_
 - exception message clarified
 - prefix lengths comment updated
 - couple EXPECT_NO_THROWs added to subnet unit-tests

 - hooks documentation updated
 - dhcp4 message logs updated
 - long lines wrapped in dhcp4_srv.cc
 - unit-test names now use camel notation
 - Pkt4::bufferOut_ renamed to buffer_out_

 - pointers to DHCPv4 and DHCPv6 hooks removed
 - Many methods in HooksManager are now called directly in
   dhcp4_srv.cc, dhcp4_srv_unittest.cc and alloc_engine_unittest.cc
 - Comments wrapped up differently in dhcp4_srv_unittest.cc
 - Comments clarified in alloc_engine.{cc|h}

- callouts called using HooksManager::callCallouts
- removed Dhcp6Srv::getServerHooks() and getHooksManager() declarations.
- updated sendPacket comment (reception->transmission)
- documented getCalloutHandle()
- indentation fixed for getSubnets6()

 - pkt6_receive, subnet6_select, lease6_select, pkt6_send
 - framework updated
 - some unittests implemented

Explicit allocation failures cause the return of packet to the client
indicating that the address allocation has been refused.  Also added
was a "catch" for other exceptions - this causes the packet from the
client that generated the exception to be ignored.

 - DORA support added
 - REQUEST/Renewing support added
 - RELEASE support added
 - AllocationEngine now supports lease4 renewals
 - many other smaller code additions
 - many tests written

- detailedLeaseCompare unified (alloc_engine and mysql_lease_mgr)
- comments clarified