- Dhcpv6Srv::process*() methods does not use references anymore
- Dhcpv6Srv::shutdown variable added for ordered shutdown procedure
- Dhcpv6Srv is now in isc::dhcp namespace
- Dhcpv6Srv is now derived from boot/noncopyable
- IfaceMgr methods and fields are now commented appropriately
- IfaceMgr
- Dhcpv6Srv friend declaration removed
- Dhcpv6SrvTest now uses derived class to access protected methods
- Dhcpv6SrvTest Solicit_Basic test now includes client-id, checks for
  received client-id, server-id and content of ia
- IfaceMgrTest minor improvements

See comments in #1186 ticket for extensive list of smaller changes
and reasons behind them.