accounts: don't remove accounts while device is in safe mode

Userspace apps are not available in safe mode, so authenticators are not available when
the system starts and checks all accounts. Just ignore these accounts and not add them
to the list of accounts.

JIRA: CYAN-4074
Issue: https://jira.cyanogenmod.org/browse/CYAN-4074
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
Change-Id: I9cac5084c29fe33a0215ab4a9e693f58712438ac
Fix frontOfTask assignment.

If all activities of a given stack were finishing, no activity was
marked as front-of-task. This confused ActivityManager, so make sure
there's always exactly one activity marked as front-of-task.

Change-Id: I087cbe10280d4a60aa5ccfaefe24a223523fb3f2
Wifi: Use bss->age identifier for wifi scan results

This value will be used as "timestamp" and Google Play Services
uses this value for identifying sane wifi scan items.

The current timestamp (tsf=) has a different meaning, which causes
the Google Location Resolver to ignore all wifi scan entries and
therefore no location can be resolved.

This solution is already done on batched result parsing, but
missing on the traditional scans.

Change-Id: I36a1aeb666379e6a010298f09161e971012db83f
MountService: Handle UUID in list response

Change-Id: Ifee8905ae01c17c79b218ec131650c25f6e977d6