Finish issue #10779747: Calendar Storage crash observed...

...while setting up a new user from settings.

We can now delay broadcasts when there are enough background services
currently starting (still set to 1 for svelte devices, 3 for normal
devices).

Add new intent flag to not allow receivers to abort broadcasts, which
I use to fix an issue with the initial BOOT_COMPLETED broadcast not
actually requesting pss data at the right time -- it can now be sent
as an ordered broadcast without the ability for the receivers to cancel
it.

Change-Id: I51155bbbabe23e187003f3e2abd7b754e55d3c95