Remove hardcoded usage of v2 authentication in Barbican actions

[Jose Castro Leon]

The v2 authentication has been removed in keystone and the barbican actions are still relying on it to authenticate

---
/mistral/actions/openstack/actions.py
@@ class BarbicanAction(base.OpenStackAction):
         LOG.debug("Barbican action security context: %s", context)

         barbican_endpoint = keystone_utils.get_endpoint_for_project('barbican')
         keystone_endpoint = keystone_utils.get_keystone_endpoint_v2()

         auth = identity.v2.Token(
             auth_url=keystone_endpoint.url,
             tenant_name=context.user_name,

             token=context.auth_token,
             tenant_id=context.project_id
         )

         return self._get_client_class()(
---

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/585318
Committed: https://git.openstack.org/cgit/openstack/mistral/commit/?id=36f28dec45dd07691995e939e7d04708c59483f4
Submitter: Zuul
Branch: master

commit 36f28dec45dd07691995e939e7d04708c59483f4
Author: Jose Castro Leon <email address hidden>
Date: Tue Jul 24 13:32:07 2018 +0200

    Remove hardcoded usage of v2 authentication in Barbican actions

    There are still some hardcoded v2 authentication in barbican actions.
    This api has been deprecated and removed, so we can change it to use
    instead v3. It also removes the version number from some helper methods.

    Change-Id: I0390daf841463d11cb7c61653897949989b6e6eb
    Closes-bug: #1783316

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/mistral 7.0.0.0b3 development milestone.