UI test automation service should not be auto reconnected.

1. Since adb is restarted on user switch it makes no sense to
   try to reconnect the ui automation service since it will
   be killed on a user switch.

   Disabling touch exploration on UI automation service
   connect since it can explicitly put the device in this
   state if needed.

bug:6967373

Change-Id: I8cfde74f28f3f03d4ccf24746d43b8178ae2b5ef