Add pyton test script

Taken from
https://github.com/civetweb/civetweb/issues/555#issuecomment-347069525

test/pytest.linux.cgi

@@ -0,0 +1,5 @@
+#!/usr/bin/python
+import os
+print("Content-Type: text/plain \n\n")
+print("This is from python")
+