Rename Meta-Action to Action

Some Python class and packages need to be renamed
for a better compliance with the shared terminology
which provides a better understanding of Watcher
objects and components by every contributor.

This patchset is there to change Meta-Action to Action

Partially implements: blueprint glossary-related-refactoring

Change-Id: Ie67b800332179be93718030ddd7a36ddc76a544c

watcher/decision_engine/solution/base.py

@@ -57,6 +57,6 @@ class Solution(object):
             "Should have implemented this")  # pragma:no cover
 
     @abc.abstractproperty
-    def meta_actions(self):
+    def actions(self):
         raise NotImplementedError(
             "Should have implemented this")  # pragma:no cover

watcher/decision_engine/solution/default.py

@@ -24,20 +24,21 @@ LOG = log.getLogger(__name__)
 
 class DefaultSolution(Solution):
     def __init__(self):
-        self._meta_actions = []
-
-    def add_change_request(self, r):
-        self._meta_actions.append(r)
-
-    def __str__(self):
-        val = ""
-        for action in self._meta_actions:
-            val += str(action) + "\n"
-        return val
-
-    @property
-    def meta_actions(self):
-        """Get the current meta-actions of the solution
+        """The DefaultSolution class store a set of actions generated by a
+        strategy in order to achieve the goal.
 
         """
-        return self._meta_actions
+        super(DefaultSolution, self).__init__()
+        self._actions = []
+
+    def add_change_request(self, r):
+        self._actions.append(r)
+
+    def __str__(self):
+        return "\n".join(self._actions)
+
+    @property
+    def actions(self):
+        """Get the current actions of the solution
+        """
+        return self._actions