Add wraps function to decorator
Add wraps function to decorator

In order to preserve the docstring and function name the decorator "wraps"
is needed.

See:
https://docs.python.org/2/library/functools.html#functools.wraps

TrivialFix

Change-Id: I9f74376449bb97745fa1c52c79bfdd9468526560

bswartz/manila,openstack/manila,bswartz/manila,NetApp/manila,vponomaryov/manila,openstack/manila,NetApp/manila,vponomaryov/manila