cleaned up mock tests on hzObjectPathMap. split out code for mocking a datastore into MockObjectPathMap.
initialize Hazelcast from the custom configuration when initializing the Metacat service.
exercise the shared hazelecast system metadata map and custom loader/store by inserting normally and also directly into the map. both mechanisms allow up to read the same system metadata (only tested on single local instance)
test hzSystemMetadata Map and custom loader