Added quote calls to rating processors

Use self.process by default but overriding it can be useful
in case a processors is tracking the state of a calculation
and you don't want to disrupt it.

Change-Id: I9505adfdc65b0decfa3586c0636d091f41ecfb7d

cloudkitty/billing/__init__.py

@@ -73,6 +73,15 @@ class BillingProcessorBase(object):
         client.cast({}, operation, name=self.module_name)
         return module_db.set_state(self.module_name, enabled)
 
+    def quote(self, data):
+        """Compute rating informations from data.
+
+        :param data: An internal CloudKitty dictionary used to describe
+                     resources.
+        :type data: dict(str:?)
+        """
+        return self.process(data)
+
     @abc.abstractmethod
     def process(self, data):
         """Add billing informations to data

cloudkitty/orchestrator.py

@@ -124,7 +124,7 @@ class APIWorker(BaseWorker):
 
     def quote(self, res_data):
         for processor in self._processors.values():
-            processor.process(res_data)
+            processor.quote(res_data)
 
         price = decimal.Decimal(0)
         for res in res_data: