fix default version
fix default version

recent refactor seems to have caused a regression
with the client default version, using openstack
client causes this error:

Invalid client version 1; must be one of: v1

Closes-Bug: 1705322
Change-Id: Ib3d8efce41c00ab8573461ea30357d1a611529e5
Signed-off-by: Thiago da Silva <f23d94b2a735b6193d3882ae31308d2e41e8282b@redhat.com>

openstack/python-barbicanclient