Bad goal and strategy name for Airflow Optimization

The goal name 'airflow optimization' must be synched with the
entry point name.
The strategy name 'uniform airflow' must be synched with the
entry point name.

Partial-Bug: #1602262

Change-Id: Ibc6f0a7c5047e57549910818200c323b878152b0

watcher/decision_engine/goal/goals.py

@@ -148,7 +148,7 @@ class AirflowOptimization(base.Goal):
 
     @classmethod
     def get_name(cls):
-        return "airflow optimization"
+        return "airflow_optimization"
 
     @classmethod
     def get_display_name(cls):

watcher/decision_engine/strategy/strategies/uniform_airflow.py

@@ -106,7 +106,7 @@ class UniformAirflow(base.BaseStrategy):
 
     @classmethod
     def get_name(cls):
-        return "uniform airflow"
+        return "uniform_airflow"
 
     @classmethod
     def get_display_name(cls):