Don't create enrichers (i.e. quorum check) for quarantine entity.

Fixes the following problems:
  * If the items in the quarantine entity are removed (either unmanaged or no longer on fire) the quarantine gets {running: false, ON_FIRE: true} state due to the enrichers.
  * If the Clear Problems from UI is executed on quarantine in gets {running: true} state.
This closes #391

* github/pr/391:
  Don't create enrichers (i.e. quorum check) for quarantine entity.