Get keyring content failed when ceph auth disabled

[Dou Rui Yuan]

when ceph auth disabled, the user and keyring will both be None in connection_properties, but _check_or_get_keyring_contents must return strings as file writelines required.

{u'secret_type': u'ceph', u'device_path': u'vdb', u'name': u'cinder-volumes/volume-8331a39a-548a-4d67-92cd-2edd06a7a2f6', u'encrypted': False, u'keyring': None, u'conf_file': u'/etc/ceph/ceph.conf', u'cluster_name': u'ceph', u'secret_uuid': None, u'qos_specs': None, u'auth_enabled': False, u'hosts': [u'192.168.113.2', u'192.168.113.3', u'192.168.113.27'], u'volume_id': u'8331a39a-548a-4d67-92cd-2edd06a7a2f6', u'discard': True, u'access_mode': u'rw', u'auth_username': None, u'ports': [u'6789', u'6789', u'6789']}

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/638608

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/638608
Committed: https://git.openstack.org/cgit/openstack/os-brick/commit/?id=a6dff156d70cd79e87c71bea53aa634311f22459
Submitter: Zuul
Branch: master

commit a6dff156d70cd79e87c71bea53aa634311f22459
Author: Rui Yuan Dou <email address hidden>
Date: Fri Feb 22 16:53:28 2019 +0800

    Fix get keyring content failed when ceph auth disabled

    When ceph auth diasbled, both 'user' and 'keyring' will be 'None',
    and the method _check_or_get_keyring_contents must return strings
    for ceph conf file writelines() generation.

    Change-Id: Ieafd40ace4f50c1a966c9097c5de270c68b0666b
    Closes-Bug: #1817271

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/os-brick 2.8.0 release.