Change the remote user agent session version variable

from an int to a uint64_t. This prevents potential comparison
problems from happening if the version string exceeds
INT_MAX. This was an apparent problem for one user who could
not properly place a call on hold since the version in the
SDP of the re-INVITE to place the call on hold greatly 
exceeded INT_MAX.

This also aligns with RFC 2327 better since it recommends
using an NTP timestamp for the version (which is a 
64-bit number).


(closes issue #13531)
Reported by: sgofferj
Patches:
      13531.patch uploaded by putnopvut (license 60)
Tested by: sgofferj



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@158230 65c4cc65-6c06-0410-ace0-fbb531ad65f3