System accessibility state update postponed if UI test autmation is running.

1. If a UI test automation accessibility service is connected to the
   system we pospone state updates in the AccessibilityManagerService
   for the moment the UI automations service dies or is disconnected.

bug:6540522

Change-Id: I48ddf603b53d2158a00edcf8ad05cfe2575d4d75
1 file changed