CLOUDSTACK-4939 - Failed to create snapshot (KVM, Multiple hosts, Sharedstorage)

Conflicts:

	engine/storage/datamotion/src/org/apache/cloudstack/storage/motion/AncientDataMotionStrategy.java
	engine/storage/src/org/apache/cloudstack/storage/endpoint/DefaultEndPointSelector.java
	plugins/storage/volume/default/src/org/apache/cloudstack/storage/datastore/driver/CloudStackPrimaryDataStoreDriverImpl.java