Use configparser in rpc-tests.py
Summary:
Backport the following commit from Bitcoin Core
commit 1581ecbc33edd9d6257e50b11d8854fbccaf8ad8 Author: John Newbery <john@johnnewbery.com> Date: Mon Jan 30 14:57:27 2017 -0800 Use configparser in rpc-tests.py Remove the use of wildcard imports in rpc-tests.py and replace with configparser.
Test Plan: make check && ./qa/pull-tester/rpc-tests.py
Reviewers: deadalnix, freetrader, #bitcoin_abc, Yura
Reviewed By: deadalnix, #bitcoin_abc
Differential Revision: https://reviews.bitcoinabc.org/D817