Place ephemeral storage mount in site manifest

Mount ephemeral storage in site manifest.  Remove dependence on cloud
type custom fact.  Align storage approach with Henrik's manifest for GCE
nodes. Use internal ruby functionality to establish facts.

Changes:
   * modified:   condor/manifests/client.pp
   * modified:   gce_node/manifests/init.pp
   * deleted:storage/manifests/init.pp
   * modified:   condor/lib/facter/central_manager.rb
   * modified:   gce_node/lib/facter/cloud_type.rb