core (memory/encryption): added getNamespaces method to retrieve all plugins namespaces

sat/memory/encryption.py

@@ -104,6 +104,11 @@ class EncryptionHandler(object):
                 u"Can't find requested encryption plugin: {namespace}").format(
                     namespace=namespace))
 
+    @classmethod
+    def getNamespaces(cls):
+        """Get available plugin namespaces"""
+        return {p.namespace for p in cls.getPlugins()}
+
     @classmethod
     def getNSFromName(cls, name):
         """Retrieve plugin namespace from its name