And store some more ip infos in the listener struct

also allow to specify a blank ip which means: all

FS-3098 You are probably right about the sql statement, we must have missed that when the contributor gave us the patch. Be aware this code is depricated in favor of the broadsoft SCA shared appeareances and will probably be removed eventually

Fix storage class for 'cause' in user_outgoing_channel() so that each call has its very own hangup cause

- allow infinite registrations (expire=0)
- when removing a registration, keep the other with same user if multiple reg is allowed

FS-3054 --comment-only try latest commit, I can guess what probably causes the seg based on my last patch

ESL-56 null terminate buffer after reading from the socket to prevent cross-over to old data that confuses the parser and throws off framing. (regression from 2081bf97)