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* NIFI-10001: When enabling a collection of Controller Services, changed logic. Instead of enabling dependent services and waiting for them to complete enablement before starting a given service, just start the services given. The previous logic was necessary long ago because we couldn't enable a service unless all dependent services were fully enabled. But that changed a while ago. Now, we can enable a service when it's invalid. It'll just keep trying to enable until it becomes valid. At that point, it will complete its transition from ENABLING to ENABLED. * NIFI-10001: Restored previous implementation for StandardControllerServiceProvider, as the changes were not ultimately what we needed. Changed StandardProcessGroup to use a ConcurrentHashMap for controller services instead of a HashMap with readLock. This was causing a deadlock when we enable a Controller Service that references another service during flow synchronization. Flow Synchronization was happening within a write lock and enabling the service required a read lock on the group. Eventually the thread holding the write lock would timeout and release the write lock. But this caused significant delays on startup. By changing to a ConcurrentHashMap, we alleviate the need for the Read Lock. Also noticed in testing that the StandardNiFiServiceFacade did not save flow changes when enabling dependent services so added call to controllerFacade.save().