Workaround for corner case in TransitionManager

This works around a problem where removing a review with unfinished
transitions results in leaked object references to KeyguardTransportControlView.

The workaround disables transitions until we have a better fix.

Fixes bug 11307391

Change-Id: I1df82f2c6f1cd9f5c9076d4c76cfd4aec3b6806c