[flexiglass] Minor tweaks to support Trust Managers.

The "trust manager" is a system that allows the user to select friendly
networks, devices, or locations, where their device can become more
relaxed and only automatically lock after 4 hours or when explicitly
locked using the power menu's "lockdown" option.

Since the trust system occurs in the upstream, Flexiglass didn't need to
make any changes to have it work with it. The device simply doesn't
enter locked state or enters lock state through the lockdown power menu
option and Flexiglass obeys.

The problem is with some transitions that Flexiglass didn't support:
1. Swiping up lockscreen while lockscreen is unlocked should dismiss the
   lockscreen (even if the auth method is not swipe). This supports
   dismissing the lockscreen from AOD if, ever needed (likely, this is
   no needed as the device must be woken up before user input can be
   processed)
2. (more important than #1), automatically dismiss the lockscreen and go
   to the Gone scene if the device wakes up while unlocked, regardless
   of which auth method is currently selected. This prevents the
   Flexiglass lockscreen scene UI from showing over the unlocked
   Launcher UI both while the device is unlocked due to the trust manager or due to the lock timeout not having elapsed yet.

Fix: 281730986
Fix: 294283030
Test: updated unit tests
Test: added new integration test cases
Test: manually verified that trust managers and lockdown mode both work
(see b/281730986#comment2 for details)
Test: manually verified the the screen off + screen on (within less time
than the lock timeout) scenario doesn't end up with a lockscreen over
the launcher.

Change-Id: Ia9d5b620d78c2ad7e47ceb218e7765bdf5eed52d