Unable to enable swift on ceph backend

[Maria Yousaf]

Brief Description
-----------------
Swift cannot be enabled on the ceph backend

Severity
--------
Major

Steps to Reproduce
------------------
- Run system storage-backend-modify -s cinder,swift,nova,glance ceph-store
- The following error is returned: Swift is already enabled through service parameter
- Looking at system service-parameter-list, swift is set to false

Expected Behavior
------------------
Swift should be added in the ceph backend

Actual Behavior
----------------
Swift provisioning is rejected

Reproducibility
---------------
100%

System Configuration
--------------------
Storage

Branch/Pull Time/Commit
-----------------------
StarlingX master as of 2018-10-01_20-18-00

[Ghada Khalil (gkhalil)]

stx.2018.10 - issue introduced recently by code changes for: https://storyboard.openstack.org/#!/story/2003518

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/609505

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/609505
Committed: https://git.openstack.org/cgit/openstack/stx-config/commit/?id=76724fe4d2bfac2233f4a92aaa0a8a28a6b74d1e
Submitter: Zuul
Branch: master

commit 76724fe4d2bfac2233f4a92aaa0a8a28a6b74d1e
Author: Jack Ding <email address hidden>
Date: Wed Oct 10 13:39:36 2018 -0400

    Correct checking of swift_enabled service param

    The checking of swift_enabled service parameter should be against value
    instead of against object. The incorrect checking produced false
    positive, as a result Ceph-backed Swift could not be activated.

    Closes-Bug: 1796912
    Change-Id: I712221f882437f92f1f08e22d5db2265258ccc9e
    Signed-off-by: Jack Ding <email address hidden>

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: r/2018.10
Review: https://review.openstack.org/609770

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/609770
Committed: https://git.openstack.org/cgit/openstack/stx-config/commit/?id=c01e701cbf51ba1ceb3967bc0886a72b7d894065
Submitter: Zuul
Branch: r/2018.10

commit c01e701cbf51ba1ceb3967bc0886a72b7d894065
Author: Jack Ding <email address hidden>
Date: Wed Oct 10 13:39:36 2018 -0400

    Correct checking of swift_enabled service param

    The checking of swift_enabled service parameter should be against value
    instead of against object. The incorrect checking produced false
    positive, as a result Ceph-backed Swift could not be activated.

    Closes-Bug: 1796912
    Change-Id: I712221f882437f92f1f08e22d5db2265258ccc9e
    Signed-off-by: Jack Ding <email address hidden>