remove "volume:services" rule from policy.json

[Anna Sortland]

I don't see any cinder code that is using this policy rule in sample /etc/cinder/policy.json:
   "volume:services": "rule:admin_api".
The cinder/api/contrib/services.py is using "volume_extension:services": "rule:admin_api".
If "volume:services" rule is not used, it should be deleted.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/202599

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/202599
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=e71c02ecc95e79c96b9e4c07b1aae5bb7377f960
Submitter: Jenkins
Branch: master

commit e71c02ecc95e79c96b9e4c07b1aae5bb7377f960
Author: Anna Sortland <email address hidden>
Date: Thu Jul 16 09:33:46 2015 -0500

    Remove "volume:services" rule from policy.json

    The rule "volume:services": "rule:admin_api" does not seem to be used.
    The cinder/api/contrib/services.py is using "volume_extension:services".
    This change deletes "volume:services" rule from policy.json.

    Change-Id: Id1d23e44c5b7e8361e21c8568ff67f0012e5c097
    Closes-Bug: #1471990