Add address_types test

Improvements and cleanups by John Newbery

test/functional/test_runner.py

@@ -78,6 +78,7 @@ BASE_SCRIPTS= [
     'abandonconflict.py',
     'bip68-112-113-p2p.py',
     'rawtransactions.py',
+    'address_types.py',
     'reindex.py',
     # vv Tests less than 30s vv
     'keypool-topup.py',