Hang up original swapped connection

In the past, when we swapped an unknown connection with
an old original connection, we did not hang up the call.
This causes the old connection to stay active in the
CallTracker and can block new calls.

Bug: 62114647
Test: Manual E911 Testing
Merged-In: I019bb488c7dee6404c09751824194d2037068e1c
Change-Id: I68928e3a419f7ecc059f33142a6c6efb19eecbac
1 file changed