T310 is not cancelled upon receiving handover command

After a successful Handover procedure and establishing new connection, it takes 100ms due to default in-sync period to a UE to run LteUeRrc::DoNotifyInSync() method and if T310 expires before it even though the UE is in 'in-sync' state every thing crash because of running scheduled LteUeRrc::RadioLinkFailureDetected () method.

So we should run LteUeRrc::DoNotifyInSync() method immediately after successful Handover procedure.