apt/package.py: Fix BaseDependency.__dstr.__ne__()

It turns out I missed this. Just simplify it to return not
self.__eq__(other). Also add a test case for it.

Reported-by: Michael Schaller <michael@5challer.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/apt/package.py b/apt/package.py
index 78b10af4..5d122968 100644
--- a/apt/package.py
+++ b/apt/package.py
@@ -78,7 +78,7 @@ class BaseDependency(object):
             return str.__eq__(self, other) or str.__eq__(2 * self, other)
 
         def __ne__(self, other):
-            return str.__eq__(self, other) and str.__ne__(2 * self, other)
+            return not self.__eq__(other)
 
     def __init__(self, name, rel, ver, pre, rawtype=None):
         self.name = name