Move CLTV from scriptSig to scriptPubKey in bip65-cltv-p2p.py

Summary:
Prepare for magnetic anomaly with push-only rule

Depends on D2119

Test Plan:

./test/functional/test_runner.py bip65-cltv-p2p

Reviewers: #bitcoin_abc, deadalnix, jasonbcox

Reviewed By: #bitcoin_abc, deadalnix, jasonbcox

Subscribers: jasonbcox, teamcity, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D2120