support/testing: add python-treq tests

Use a simple script to check the basic usage. The target has no https
server, so a connection from in the target to localhost must not
succeed.

Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

support/testing/tests/package/sample_python_treq.py

@@ -0,0 +1,16 @@
+from twisted.internet import reactor
+import treq
+
+
+def done(response):
+    print(response.code)
+    reactor.stop()
+
+
+def err(fail):
+    print(fail.value)
+    reactor.stop()
+
+
+treq.get("https://localhost").addCallback(done).addErrback(err)
+reactor.run()