Disable service-based discovery filter

With KNOX-2680, the Knox team introduced two major changes in Cloudera Manager service discovery:

• the first is that Knox only discovers services that are actually listed in the given descriptor (instead of discovering the entire cluster)
• from now on, Knox maintains an in-memory repository of discovered data (cluster, service, and role configs). Caffeine is used as the cache implementation with the default of 10 mins of cache entry TTL.

It turns out the first improvement may cause redundant topology redeployments due to "missing" service discovery details while the Polling Configuration Analyzer finds a relevant event that belongs to a service that was not included in the latest discovery round.

For now, we should disable that feature temporarily until it's clear how to enable and address the redundant redeployment issue.