Dismiss lockscreen before running host-side CTS

Test APK can run on screen-locked device but test activity can't be
started. Lock screen has to be dismissed before running test activity.

Fixes: 37647307
Test: Running CTS on screen-locked device.
    $ cts-tradefed run singleCommand cts-dev -m CtsInputMethodServiceHostTestCases

Change-Id: I0c6cf4ee0d63ba072e305cc60f4bfa8a0dbcb27f
1 file changed