do not register legacy providers which are always pre-registered

Confirmed with CSM team, that these 2 are always pre-registered. 
The ultimate right way for handling provider registration is to do it on demand such as before "creating". But that item didn't make to the current sprint. At the same time, in some subscriptions, these 2 providers could stay at "registering" forever, and causes 50+ seconds for any commands to run.