Startup WAP PUSH service before handling SMS messages

SMS message handling which has been received while the device is locked
starts just after unlocking the device. Then WAP PUSH service may not
finish starting and WAP PUSH SMS message may not be processed.

To resolve the problem, enable to bind WapPushManager during DirectBoot
and ensures that SMS messages are processed when unlocked. And change
the storage of database used by WapPushManager to support DirectBoot.

Test: manual - Confirm that WapPushOverSms#onServiceConnected() is
called during DirectBoot.
Confirm that WapPushManager#WapPushManager() is called when unlocking
the screen.
Test: auto - Passed WapPushTest#testDataBaseMigration.
Bug: 141654363

Change-Id: I3eebfea6a6da920f9aca674073c2cd3563cbd658