* Allow for DI of config and PoolCounterConnectionManager.
* Manage the PoolCounterConnectionManager singleton without using
a global/static field.
* Allow for test overrides (in ParserOutputAccessTest) without needing
to bring all of ObjectFactory and 'factory' and thus exposing class
constructors to stable interface (except not really since the args
are hardcoded in practice).
Bug: T201223
Change-Id: I514fee20b388f04f9c85c5a1373845d621c65395
