Print version before tests

This helps with debugging of import-related issues - we know the version
under test before the test has a chance to hang.

Change-Id: If13cba60a19e9c15885355f85def4d134fa37993
Related: OS#2821
diff --git a/tests/test_py3.py b/tests/test_py3.py
index 909d057..1c0c19b 100644
--- a/tests/test_py3.py
+++ b/tests/test_py3.py
@@ -38,6 +38,8 @@
     test_host = '127.0.0.5'
     test_port = str(random.randint(1025, 60000))
 
+    print('Testing v%s on %s:%s' % (__version__, test_host, test_port))
+
     # Each client connection will create a new protocol instance
     server = loop.run_until_complete(loop.create_server(CtrlProtocol, test_host, test_port))