Disconnect all calls that are not reused when placing new call

This fixes a bug with Google voice calls where a call that was not
reused was causing future calls to be rejected.

Also log an error when there is no more room for an outgoing call
to make it easier to debug.

Bug: 18481759
Change-Id: I20da180211d81fdf23e50479619a1f6a8a303c9b
1 file changed