Use a regex to determine the list of sources for check-rpc-mappings
The script used to take a constant list to determine the source files to
be parsed. This is not ideal as it is easy to forgot to add/remove one
when the code is updated.
This diff sets the input to a list of regexes so that the parsing
remains narrow scoped while reducing the amount of maintenance for the
time ./test/lint/check-rpc-mappings.py .
Check the output is the same, and that there is no significant
Reviewers: #bitcoin_abc, deadalnix, jasonbcox
Reviewed By: #bitcoin_abc, deadalnix, jasonbcox
Subscribers: jasonbcox, deadalnix
Differential Revision: https://reviews.bitcoinabc.org/D3757