Use fact to define condor central manager

Use the central_manager fact to determine condor central manager rather
than passing the head variable.

Changes:
	modified:   manifests/client.pp
	modified:   templates/condor_config.local.csnode.erb
	modified:   templates/condor_config.local.head.erb
	modified:   templates/condor_config.local.node.erb
	modified:   templates/condor_config.local.submit.erb