LockScreenShield: Add GrabScreen function and retry to make sure we really get grab

It might happen that the grab is not possible because the PluginAdapter::IsScreenGrabbed request has still not being fully processed, and thus nux is not able to grab the pointer/keyboard. By doing this we instead try to grab the screen, and if this is not happening, we wait a little until we don't get the ungrab event. In this way, if we eventually get the grab, all will work as expected. Otherwise, we cancel the lock request (very unlikely to happen). Fixes: 1349128 Approved by: Brandon Schaefer (bzr r3847)

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