Update lock screen messages to match UX expectations.

Fixes: 248048347
Test: atest KeyguardIndicationControllerTest
Test: 1. manually, enter lockdown mode, see "Unlock for all features and data" message.
      2. Lock out FP, see swipe to open always on lockscreen.
Change-Id: I6648b7d770485a7bd8c9d34d90863c530c7a92f7