IBMNAS driver fails to resize volume after setting 600 or 660 permissions to volume

[Sasikanth Eda]

Based on the discussion of drivers setting inappropriate permissions (https://wiki.openstack.org/wiki/OSSN/OSSN-0014), ibmnas driver inherits _set_rw_permissions_for_all() from nfs.py which sets 666 to the volumes.
Changes are expected to be made in nfs.py such that it sets 600 or 660 permissions, while doing so ibmnas driver fails performing the operation _resize_volume_file(). This can be fixed by performing resize operation using root user.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/101919

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/101919
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=ea56cf255ac956d23eba5bb4f6e7312b944eb5fb
Submitter: Jenkins
Branch: master

commit ea56cf255ac956d23eba5bb4f6e7312b944eb5fb
Author: Sasikanth <email address hidden>
Date: Mon Jun 23 19:40:12 2014 +0530

    Update _resize_volume_file() to support appropriate permissions

    ibmnas driver inherits _set_rw_permissions_for_all() from nfs.py
    which sets 666 to the volumes. Changes are expected to be made in
    nfs.py such that it sets 600 or 660 permissions, by doing so
    ibmnas driver fails performing the operation _resize_volume_file()

    Adding run_as_root in resize_volume operation.

    Change-Id: Iecaf111f96f93b4e24bd81edd6aa82829113b4bb
    Closes-Bug: #1333252