Revert "Cleanup unused contrib scripts"

Summary:
This reverts commit b86f0e99002157f8e415a5d2198d78f77612f336.
Reverts https://reviews.bitcoinabc.org/D1504

Test Plan: N/A. Need to fix these scripts up a bit first

Reviewers: deadalnix, schancel, #bitcoin_abc

Reviewed By: deadalnix, #bitcoin_abc

Subscribers: teamcity

Differential Revision: https://reviews.bitcoinabc.org/D2052