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c90c8d78 - Enhance Hight level APIs CLusterClient/ClusterServer and Devices (#452)

Enhance Hight level APIs CLusterClient/ClusterServer and Devices (#452) * "Supported" is more generic usable than "Present" * Introduce new convenient methods to check existence of attributes, events and commands * Enhance and Fix Endpoint logging * Convenience methods to set reachability flag * Enhance ClusterServer tests, add ClusterClient tests * Use it also in IntegrationTest