Do not unpark children of blocks outside of the RPC
Summary:
As per title. When unparking chain automatically, we do not want to unpark all children by default. Only the RPC should do this.
Depends on D2004
Test Plan:
make check ./test/functional/test_runner.py --extended
Reviewers: #bitcoin_abc, jasonbcox, schancel
Reviewed By: #bitcoin_abc, jasonbcox, schancel
Subscribers: jasonbcox
Differential Revision: https://reviews.bitcoinabc.org/D2057