```
Backport the following commit from Bitcoin Core:
commit f8ac2479767309ca4f859e90fbeda84e639c8a72 (HEAD -> qa)
Author: John Newbery <john@johnnewbery.com>
Date: Tue Jan 31 11:32:49 2017 -0800
Improve rpc-tests.py arguments
A few miscellaneous improvements to rpc-tests.py command line arguments:
- make all arguments start with double dash for consistency
- improve help text and output
- add nozmq argument to explicitly exclude the ZMQ tests
- change 'parallel' to 'jobs'
```