Test that a non-witness script as witness utxo is not signed
The rpc test was aletered to add a new node or the "signer" tests run out of node to run on.
This is a partial backport of Core PR13917 : https://github.com/bitcoin/bitcoin/pull/13917/commits/7c8bffdc24e005c3044a9a80bbc227b2a39b8605
make check ./test/functional/test_runner.py
Reviewers: #bitcoin_abc, Fabien
Reviewed By: #bitcoin_abc, Fabien
Differential Revision: https://reviews.bitcoinabc.org/D4475