- handle RegisterMessage
- keep device infos (attached to listener)
- respond with RegisterAckMessage
- handle port message (do nothing)
- handle keepalive message (do nothing for now)

and:
- clean memory pools usage
- date_format is fixed length

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@16749 d0543943-73ff-0310-b7d9-9358b9ac24b2