Revert changes to test/completion and test/static_analysis except for 2.6 comment removal

test/static_analysis/attribute_error.py

@@ -1,4 +1,4 @@
-class Cls:
+class Cls():
     class_attr = ''
     def __init__(self, input):
         self.instance_attr = 3
@@ -77,7 +77,7 @@ return_one(''.undefined_attribute)
 [r for r in [1, 2]]
 
 # some random error that showed up
-class NotCalled:
+class NotCalled():
     def match_something(self, param):
         seems_to_need_an_assignment = param
         return [value.match_something() for value in []]