Don't fall when just loading keystonev3 modules

this avoids loading warnings on salt-master that may not have
os-client-config installed, as salt tries to load them irrespective of
__virtual__() result.

Change-Id: I348746432de0f2c635624e2fe6d627b0da587275
Related-Issue: https://mirantis.jira.com/browse/PROD-26920
(cherry picked from commit 77a7e9ce8caeafa443886da7f3f44df222f3c1fe)
1 file changed