New warlock 1.3.0 breaks tags updating

[Mike Fedosin]

When we try to update tags with warlock 1.3.0 we get an error:

functional.tests.image.v2.test_image.ImageTests.test_image_unset
----------------------------------------------------------------

 Captured traceback:
 ~~~~~~~~~~~~~~~~~~~
     Traceback (most recent call last):
       File "functional/tests/image/v2/test_image.py", line 71, in test_image_unset
         self.openstack('image set --tag 01 ' + self.NAME)
       File "functional/common/test.py", line 53, in openstack
         return execute('openstack ' + cmd, fail_ok=fail_ok)
       File "functional/common/test.py", line 42, in execute
         result_err)
    tempest.lib.exceptions.CommandFailed: Command 'openstack image set --tag 01 7fbbb8c5da634c54aea88473e4e3c16b' returned non-zero exit status 1.
    stdout:

     stderr:
     WARNING: openstackclient.common.utils is deprecated and will be removed after Jun 2017. Please use osc_lib.utils
     400 Bad Request
     Invalid JSON pointer for this resource: '/tags/0'
         (HTTP 400)

[Mike Fedosin (mfedosin)]

Paste from glance client with warlock 1.3.0
http://paste.openstack.org/show/523636/

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/334613

[OpenStack Infra (hudson-openstack)]

Change abandoned by Mike Fedosin (<email address hidden>) on branch: master
Review: https://review.openstack.org/334613