Add support for auth against keystone on https
Add support for auth against keystone on https

Add ca cert parameter to call to create client for keystone action
 so that it can authenticate against keystone running on https.

Change-Id: Ia3aa981b3937d0c792bfea92cc76e82422f843ac
Closes-Bug: #1420806

openstack/mistral,StackStorm/mistral,StackStorm/mistral,openstack/mistral,dennybaa/mistral,dennybaa/mistral