* login/social/socialimpl: add assertions for usage stats, support bundle and oauthinfo methods
* accesscontrol/acimpl: add tests for GetRoleByName
* anonymous/sortopts: add tests for Sorter
* cloudmigration/gmsclient: add basic test cases for all methods
* shorturls/shorturlimpl: add more edge test cases
* tag/tagimpl: add test to cover duplicate tag kv and nil pairs
* updatechecker: add test cases for module
* add bundle registry service to avoid dependency cycles
* move user support bundle collector to user service
* move usage stat bundle implementation to usage stats
* add info for background service
* fix remaining imports
* whitespace
