Added hystrix commands to support wrapping mongodb calls for MongoMetadata.  Added servo/graphite setup utility.
Exclude guava from servo dependencies (pulls old version and breaks build)
Removed exclude guava because new servo vesion 0.5.5 doesn't break build
Added config.properties in all places where unit tests will use hystrix commands with isolation strategy set to SEMAPHORE
Merge remote-tracking branch 'origin/master' into dev-nmalik

Conflicts:
	mongo/crud/pom.xml
	mongo/metadata/src/main/java/com/redhat/lightblue/metadata/mongo/MongoMetadata.java