Remove hosted vars from openshift_facts.

The current pattern is causing a bunch of undesired sideffects.

Update registry_config.j2 to fix BZ#1490738

Currently, openshift_hosted role duplicates some logic
across separate task chains.  This commit cleans up
the openshift_hosted role and converts it to be
primarily used with include_role to give better
logic to the playbooks that utilize this role.

This commit also refactors the playbook that calls
various openshift_hosted roles into individual playbooks.
This allows more granularity for advanced users.

setting openshift_hosted_registry_storage_gcs_rootdirectory default value

Previously, setting the GCS registry object storage settings resulted in
an invalid configuration. This generates a registry-config secret that
has the correct file if the GCS config is set.