Fix the import warning of secrets
Fix the import warning of secrets

openstack command gets the following warning:

  /usr/lib/python3.6/site-packages/barbicanclient/__init__.py:61: UserWarning:
  The secrets module is moved to barbicanclient/v1 directory, direct import of
  barbicanclient.secrets will be deprecated. Please import barbicanclient.v1.secrets
  instead.

To fix that, import secrets from barbicanclient.v1 as the warning indicates.

Change-Id: Ib6548cfe30ce407f349cdeebec9a67e22a31bc74

openstack/python-barbicanclient