fix LooseVersion on Python2

Author: Flamefire

easybuild/tools/loose_version.py

@@ -81,6 +81,9 @@ def _cmp(self, other):
     def __eq__(self, other):
         return self._cmp(other) == 0
 
+    def __ne__(self, other):
+        return self._cmp(other) != 0
+
     def __lt__(self, other):
         return self._cmp(other) < 0