Code refactoring - Watcher Decision Engine package

This patchset is there to change the code structure.
The objective is to flatten the project file tree by merging
'api/' and 'framework/' into a single package. This also contains
some tidy ups in package naming (like using only singular nouns).

This should only affect file/folder names and their subsequent
import paths wherever they were used.

Change-Id: Ie903ba20ca5cf03b0b42efa60131d1b919b0c2c9

watcher/decision_engine/strategy/context/default.py

@@ -0,0 +1,48 @@
+# -*- encoding: utf-8 -*-
+# Copyright (c) 2015 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 oslo_log import log
+
+from watcher.decision_engine.planner.default import DefaultPlanner
+from watcher.decision_engine.strategy.context.base import BaseStrategyContext
+from watcher.decision_engine.strategy.selector.default import StrategySelector
+
+LOG = log.getLogger(__name__)
+
+
+class StrategyContext(BaseStrategyContext):
+    def __init__(self, broker=None):
+        LOG.debug("Initializing decision_engine Engine API ")
+        self.strategies = {}
+        self.selected_strategies = []
+        self.broker = broker
+        self.planner = DefaultPlanner()
+        self.strategy_selector = StrategySelector()
+        self.goal = None
+
+    def add_strategy(self, strategy):
+        self.strategies[strategy.name] = strategy
+        self.selected_strategy = strategy.name
+
+    def remove_strategy(self, strategy):
+        pass
+
+    def set_goal(self, goal):
+        self.goal = goal
+
+    def execute_strategy(self, model):
+        # todo(jed) create thread + refactoring
+        selected_strategy = self.strategy_selector.define_from_goal(self.goal)
+        return selected_strategy.execute(model)