Manage ephemeral storage for Nimbus and OpenStack clouds for csnodes

Set up ephemeral/blankspace storage to use as condor home directory on
Nimbus and OpenStack clouds.  Since the configuration depends on cloud
type this is conditional on cloud_type and thus needs to be in a module
with access to the cloud_type fact.

Changes:
   * modified:   gce_node/manifests/init.pp