pb-2903: Added error handling for  GetObjLockInfo api for cloudian objectstore.
pb-2903: Added error handling for  GetObjLockInfo api for cloudian
objectstore.

	- In the case of cloudian objectore, GetObjectLockConfiguration
	  api was returning ObjectLockConfigurationNotFound as error.
	- So added the error check to handle ObjectLockConfigurationNotFound error as well

libopenstorage/stork,libopenstorage/stork,libopenstorage/stork