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/decision_engine/goal/__init__.py

@@ -0,0 +1,26 @@
+# -*- encoding: utf-8 -*-
+# Copyright (c) 2016 b<>com
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from watcher.decision_engine.goal import goals
+
+Dummy = goals.Dummy
+ServerConsolidation = goals.ServerConsolidation
+ThermalOptimization = goals.ThermalOptimization
+Unclassified = goals.Unclassified
+WorkloadBalancing = goals.WorkloadBalancing
+
+__all__ = ("Dummy", "ServerConsolidation", "ThermalOptimization",
+           "Unclassified", "WorkloadBalancing", )