Allow to edit the fields, If glare artifact is in de-activated state

[Santhosh]

Allow to edit the fields, If glare artifact is in de-activated state.

Stack details:

2018-10-01 09:34:03.716 31384 ERROR glare.api.middleware.fault File "/usr/lib/python2.7/site-packages/glare/api/v1/resource.py", line 340, in update
2018-10-01 09:34:03.716 31384 ERROR glare.api.middleware.fault return self.engine.save(req.context, type_name, artifact_id, patch)
2018-10-01 09:34:03.716 31384 ERROR glare.api.middleware.fault File "/usr/lib/python2.7/site-packages/glare/engine.py", line 285, in save
2018-10-01 09:34:03.716 31384 ERROR glare.api.middleware.fault action_names = self._apply_patch(context, af, patch)
2018-10-01 09:34:03.716 31384 ERROR glare.api.middleware.fault File "/usr/lib/python2.7/site-packages/glare/engine.py", line 207, in _apply_patch
2018-10-01 09:34:03.716 31384 ERROR glare.api.middleware.fault utils.validate_change_allowed(af, field_name)
2018-10-01 09:34:03.716 31384 ERROR glare.api.middleware.fault File "/usr/lib/python2.7/site-packages/glare/common/utils.py", line 597, in validate_change_allowed
2018-10-01 09:34:03.716 31384 ERROR glare.api.middleware.fault raise exception.Forbidden(message=msg)
2018-10-01 09:34:03.716 31384 ERROR glare.api.middleware.fault Forbidden: Forbidden to change fields if artifact is not active or drafted.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/607849