Hoist the iam check for listAllMyBuckets outside of the bucket loop. Throw accessDenied if no permission. Fixes euca-8671

For 'testing' branch (euca 4.0), moved the code from WalrusManager to WalrusFSManager.

Conflicts:
	clc/modules/object-storage/src/main/java/com/eucalyptus/objectstorage/WalrusManager.java
Caching for edge network information broadcast - EUCA-8500

EntityCache is added for simple caching of transformed entities.

VmInstance is updated to reflect the deprecation of stats and to
remove unnecessary instance updates due only to timestamp chagne.

EUCA-8500