Python: Allow single quote strings and accept test changes.

Author: MathiasVP

python/ql/test/TestUtilities/InlineExpectationsTest.qll

@@ -233,7 +233,7 @@ private string expectationPattern() {
   exists(string tag, string tags, string value |
     tag = "[A-Za-z-_][A-Za-z-_0-9]*" and
     tags = "((?:" + tag + ")(?:\\s*,\\s*" + tag + ")*)" and
-    value = "((?:\"[^\"]*\"|\\S+)*)" and
+    value = "((?:\"[^\"]*\"|'[^']*'|\\S+)*)" and
     result = tags + "(?:=" + value + ")?"
   )
 }

python/ql/test/experimental/library-tests/frameworks/django-v1/ConceptsTest.expected

@@ -1,5 +1,3 @@
-| response_test.py:16:12:16:86 | ControlFlowNode for HttpResponse() | Unexpected result: responseBody='<img src="0" onerror="alert(1)">' |
-| response_test.py:16:89:16:171 | Comment # $HttpResponse mimetype=text/plain responseBody='<img src="0" onerror="alert(1)">' | Missing result:responseBody='<img |
 | response_test.py:21:12:21:56 | ControlFlowNode for HttpResponseRedirect() | Unexpected result: mimetype=text/html; charset=utf-8 |
 | response_test.py:21:59:21:132 | Comment # $HttpResponse mimetype=text/html; charset=utf-8 responseBody=Attribute() | Missing result:mimetype=text/html; |
 | response_test.py:25:12:25:56 | ControlFlowNode for HttpResponseNotFound() | Unexpected result: mimetype=text/html; charset=utf-8 |