Purge invalid SIP phone accounts at startup.

Adding changes to verify all the SIP phone accounts registered with
telecom and delete any invalid SIP accounts detected. SipAccountRegistry
will re-register phoneAccounts corresponding to the SIP profiles
present in the device.
This will also fix the recent change in SIP phone accounts to use
the SIP username as account handle ID instead of SIP URI. So, any
devices upgrading from L or lower releases will have new SIP
accounts automatically recreated with the new account Handle ID.

BUG: 23028921
Change-Id: I560569b4746605b1f0e7698f29178e18abf7019b
1 file changed