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/tests/api/admin/test_audit_template.py

@@ -165,7 +165,7 @@ class TestAuditTemplate(base.BaseInfraOptimTest):
 
     @test.attr(type='smoke')
     def test_update_audit_template_replace(self):
-        _, new_goal = self.client.show_goal("SERVER_CONSOLIDATION")
+        _, new_goal = self.client.show_goal("server_consolidation")
         _, new_strategy = self.client.show_strategy("basic")
 
         params = {'name': 'my at name %s' % uuid.uuid4(),

watcher_tempest_plugin/tests/api/admin/test_goal.py

@@ -24,7 +24,7 @@ from watcher_tempest_plugin.tests.api.admin import base
 class TestShowListGoal(base.BaseInfraOptimTest):
     """Tests for goals"""
 
-    DUMMY_GOAL = "DUMMY"
+    DUMMY_GOAL = "dummy"
 
     @classmethod
     def resource_setup(cls):