am 4565933f: Merge "SipService: deliver connectivity change to all sessions." into gingerbread

Merge commit '4565933f03a99750a333e97e95408c404984510f' into gingerbread-plus-aosp

* commit '4565933f03a99750a333e97e95408c404984510f':
  SipService: deliver connectivity change to all sessions.