Added ManagerTestSuite for IServices
Added ZZKTestSuite for zookeeper interfaces
Modified zzk package tests to use the ZZKTestSuite
Modified zzk/docker package tests to use the ZZKTestSuite
Modified zzk/snapshot to use the ZZKTestSuite
Modified zzk/virtualips to use the ZZKTestSuite
Included ZZKTestSuite in zzk/service and updated unit test for the hostregistry
Updated unit tests for servicestate in zzk/service
Updated unit tests for host in zzk/service
fixing smoke test
Merge pull request #1397 from control-center/feature/CC-584

CC-584: Minimizing the risk of race conditions in unit tests