Fix issue #7267494, issue #7212347

7267494 Calendar is not syncing
Check for whether a content provider is dead before returning
it.  This is kind-of a band-aid, but probably the right thing
to do; I'm just not sure exactly the full details of why this
problem is happening.  Hopefully this "fixes" it, though I don't
have a way to repro to tell.

7212347 System power off dialog is only visible to user 0
Make it visible.  Also turn on some battery debugging stuff and
clean it up so we can just keep it.

Change-Id: I5add25bf2a763c8dfe1df23bc5c753a9ea5d157a