Adding waitForKeyguardShowingAndNotOccluded on Keyguard tests.

Following test cases call gotoKeyguard() and when MotoDisplay is running
the transition takes a little longer. After this call, tests need to call
waitForKeyguardShowingAndNotOccluded to wait for keyguard.
Impacted tests are:
android.server.cts.KeyguardTransitionTests#testUnocclude
2 files changed