Add quota v1 support for volume

added dhellmann's suggestions
created entry points in setup.py
added show/set/list quotas for v1 volume

Change-Id: I8ed6a9518007b31cafeaa70a54d5bf54a549195b
Added compute service support.

Change-Id: I548e35396534b5498f31a45c752984f6d33357c3
Merge "Added compute service support."
Add metadata support for volume type

rebase
added set and unset metadata

Change-Id: I8d969e1de305975d7c71a0bad3a62b15f423c3e0