openstack: fix all volumes nuke
openstack: fix all volumes nuke

Do not allow teuthology-nuke to delete all volumes on openstack.

There is a bug on some openstack clients that --name option
does not work correctly for 'openstack volume list' in contrast
to 'openstack server list' and lists all available volumes
ignoring '--name' option at all.

Signed-off-by: Kyr Shatskyy <82d0c7561ff7e9a20a19db22e8fb5b2adaa3d71e@suse.com>

SUSE/teuthology,SUSE/teuthology,SUSE/teuthology,ktdreyer/teuthology,dmick/teuthology,ktdreyer/teuthology,ceph/teuthology,dmick/teuthology,ceph/teuthology,dmick/teuthology