Add package information to association sources.

This is often known by the system, though not always.  But when
we do know it, it is really useful to maintain that info so we can
do queries like "give me all of the associations that package X is
involved with".

Bug: 121146315
Test: manual
Change-Id: I0dd7aeb9147ecfd65a510d3b2a8bb4a0fbab57e3
10 files changed