Wait for CS Call End Reason before finishing the call session

For CS Calls, Phone state changes to IDLE as soon as call ends
but the disconnect reason is received after that. Wait for
the call end reason for all the calls before finishing the
call session. Enhance the print message with call session
information when TelephonyMetrics are dumped

Test: Make CS Calls and check logs to make sure call session
      is finished after Call End reason is obtained in
      TelephonyMetrics. Run "adb shell dumpsys activity service
      TelephonyDebugService --metrics" and ensure that the
      dump contains calls session information (call states and
      end reason)

Change-Id: I3e88b52ed170bc1fde04965ad87192ed6c5143ff