Clear the IFP bip in the version by default to avoid accidental activation
Summary: While the defautl behavior of BIP9 is to vote yes by default, it is preferable to avoid doing so accidentaly.
make check ./test/functional/test_runner.py
Reviewers: #bitcoin_abc, jasonbcox
Reviewed By: #bitcoin_abc, jasonbcox
Differential Revision: https://reviews.bitcoinabc.org/D5305