Merge #441: rename mandatory coinbase test, add it to test_runner list

2d6f137 rename mandatory coinbase test, add it to test_runner list (Gregory Sanders)

Pull request description:

Tree-SHA512: cd35c6360cbc59db480dd4ced1d07699b947ecaede985e331a9ca389af9636e942bea29bbd8d976405f0abc1e3fe8f6fbbaa36ef1d70bdbb9267e19ce61bcfbe

Author: jtimon

test/functional/mandatory_coinbase.py renamed to test/functional/feature_mandatory_coinbase.py

@@ -153,6 +153,7 @@
     'feature_blocksdir.py',
     'feature_config_args.py',
     'feature_help.py',
+    'feature_mandatory_coinbase.py',
     # Don't append tests at the end to avoid merge conflicts
     # Put them in a random line within the section that fits their approximate run-time
 ]