Python: Add copy of extractor tests

These get to live next to the existing library and query tests, and are
run as part of both the Python 2 and Python 3 language tests.

python/ql/test/extractor-tests/syntax_error/test.ql

@@ -0,0 +1,5 @@
+import python
+
+from SyntaxError s, string fp, int line, int col
+where s.hasLocationInfo(fp, line, col, _, _)
+select fp, s.toString(), line, col