Display summary for OSU provisioning status and failures

The OSU provisioning status callbacks now change the summary of
the OSU AccessPoints to a string associated with the current
provisioning status or the failure code of the last provisioning.

Tracking bug for adding robolectric tests: b/122849296

Bug: 118705403
Test: manual, build and tap on osu accesspoint and see summary
Change-Id: I599cc8077a75a4ea4a8943027117e0c741d90a05
2 files changed