Add __ne__ built-in function

In Python 3 __ne__ by default delegates to __eq__ and inverts the
result, but in Python 2 they urge you to define __ne__ when you
define __eq__ for it to work properly [1].There are no implied
relationships among the comparison operators. The truth of x==y
does not imply that x!=y is false. Accordingly, when defining
__eq__(), one should also define __ne__() so that the operators
will behave as expected.
[1]https://docs.python.org/2/reference/datamodel.html#object.__ne__

Change-Id: Ia6c59f690917a7a39d02072ceb339779296bdb91
Closes-Bug: #1586268

muranoclient/common/base.py

@@ -221,6 +221,9 @@ class Resource(object):
             return False
         return self._info == other._info
 
+    def __ne__(self, other):
+        return not self.__eq__(other)
+
     def is_loaded(self):
         return self._loaded
 

muranoclient/openstack/common/apiclient/base.py

@@ -513,6 +513,9 @@ class Resource(object):
             return False
         return self._info == other._info
 
+    def __ne__(self, other):
+        return not self.__eq__(other)
+
     def is_loaded(self):
         return self._loaded
 

muranoclient/openstack/common/apiclient/fake_client.py

@@ -77,6 +77,9 @@ class TestResponse(requests.Response):
                 self.headers == other.headers and
                 self._content == other._content)
 
+    def __ne__(self, other):
+        return not self.__eq__(other)
+
 
 class FakeHTTPClient(client.HTTPClient):