Decoupled Goal from Strategy

In this changeset, I decoupled the notion of Goal from the Strategy
by making it a distinct object. Goals are plugins that can be loaded
just like for the strategies.

Partially Implements: blueprint efficacy-indicator

Change-Id: I4378dccd508170b305aa968843228bbc8af78895

watcher_tempest_plugin/services/infra_optim/v1/json/client.py

@@ -66,7 +66,7 @@ class InfraOptimClientJSON(base.BaseInfraOptimClient):
             this audit template.
         :param extra: Metadata associated to this audit template.
         :return: A tuple with the server response and the created audit
-            template.
+                 template.
         """
 
         parameters = {k: v for k, v in kwargs.items() if v is not None}