remove unused context parameter in check_*** methods of cinder/volume/api.py

[ling-yun]

Input parameter 'context' of Check_*** methods(check_attach, check_detach, _check_metadata_properties, _check_volume_availability) in cinder/volume/api.py are not being used, so remove this 'context' parameter.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/64799

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/64799
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=3c876c67eb32ecffb58a2234c828e5cfee70ec90
Submitter: Jenkins
Branch: master

commit 3c876c67eb32ecffb58a2234c828e5cfee70ec90
Author: ling-yun <email address hidden>
Date: Fri Jan 3 16:51:50 2014 +0800

    removed unused context in check_*** methods

    Input parameter 'context' of Check_*** methods(check_attach,
    check_detach, _check_metadata_properties, _check_volume_availability)
    in cinder/volume/api.py are not being used, so remove this 'context'
    parameter.

    Change-Id: I314f662f2fe54a6b073181ff5c0f0214e9ef822a
    Closes-bug: #1265725