Generate "unique template" by default

Contributes to quattor#92

Change-Id: I152bab1c470594c47553f315bbc842e0e36e998d

Author: jouvin

lib/aquilon/worker/templates/base.py

@@ -43,7 +43,7 @@
 
 
 class Plenary(object):
-    template_type = ""
+    template_type = "unique"
     """ Specifies the PAN template type to generate """
 
     handlers = {}