SIP Part 1, move sip code

This CL moves the SIP code to
sip/src/com/android/services/telephony/sip

Moving the SIP code helps with a couple of things:
  - remove legacy dependency on old telephony code
    (PhoneUtils, etc...)
  - separate SIP from the PSTN connection code which
    is very different from SIP code
  - get the code ready for a future move out of
    Telephony all together

Bug: 14999064
Change-Id: Id32de6517d31be4aa177b2764d5bac1e1f9851c2
30 files changed