Following 7fe39e2e22ab3d0b83b86daf2a67b9122ec58f78, also add `/etc/salt/cloud.providers.d/`
Merge pull request #562 from s0undt3ch/hotfix/debian-salt-cloud-dirs

Following 7fe39e2e22ab3d0b83b86daf2a67b9122ec58f78, also add `/etc/salt/cloud.providers.d/`