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/eof.py

@@ -0,0 +1,8 @@
+
+import unittest
+
+#This should cause a syntax error at the end of line 8
+
+class TestBase(unittest.TestCase):
+
+