Dialer: Introduce usage pattern stats for retail

For retail devices (and installer builds), introduce tags to be read
by a separate, additional, package.

This will not be read or collected in any community (nightly/M/etc) or
self-built build.

Change-Id: I9ca075c2726867d693c1f16700abe6f6aa276445

Conflicts:
	src/com/android/dialer/DialtactsActivity.java
Dialer: Handle "Unknown" and null numbers when adding to blacklist.

JIRA: BACON-278
Change-Id: I819968e06387b2cf4ddd9e9d47fdf87b6099a98b