Cleanup USER_OWNER in a11y service and tests

I need to make some changes to get the tests pass.  First a11y service
will now disable when no service is specified, I need to re-enable
a11y after services are enabled.  Second the old event used in tests
seems to be filtered out by the service, I need to pick a new event.
Also the timeout waiting for mock service to start is extended, I hit
the old timeout quite often with N9.

Bug: 19913735
Change-Id: I8fe1b7b5d93b6a52df0a8940a08761ea5fbf5084