JCLOUDS-40 missing azure-common reference from azureblob.
JCLOUDS-296 unasync keystone used by swift derivatives and cloudfiles.
JCLOUDS-296 unasync legacy swift provider.
JCLOUDS-296 unasync legacy cloudfiles provider.
JCLOUDS-296 unasync legacy cloudservers provider.
JCLOUDS-296 unasync hpcloud storage provider.