Use existing AbstractReflectorAtmosphereHandler (#13514)

AbstractReflectorAtmosphereHandler handles cache requests correctly out of the box

Change-Id: I0ab96f53826cf181dc58b007fb6b4ec4eb4ad54d
Use UUIDBroadcasterCache (#13514)

Change-Id: I63c2d5886507281a9dfe219dea46dc5067ffa4e3