Merge changes If2f73495,I112651ce,Ia3a94642,I35fa1c76,Id2c5b20d, ...

* changes:
  Add enterprise id while registering network factory
  Dynamically changing MMTEL capability
  Don't report data stall for disconnected DataNetwork
  DataRetryManager don't remove unthrottled entries on cleanup
  Fixed the broken tests
  Added NOT_METERED to mutable capabilities
  Fixed IMS handover behavior on roaming network