scripted-diff: batch-rename BanMan members

Summary:
-BEGIN VERIFY SCRIPT-
sed -i "s/clientInterface/m_client_interface/g" src/banman.h src/banman.cpp
sed -i "s/setBannedIsDirty/m_is_dirty/g" src/banman.h src/banman.cpp
sed -i "s/cs_setBanned/m_cs_banned/g" src/banman.h src/banman.cpp
sed -i "s/setBanned/m_banned/g" src/banman.h src/banman.cpp
-END VERIFY SCRIPT-

This is a partial backport of Core PR14605 : https://github.com/bitcoin/bitcoin/pull/14605/commits/84fc3fbd0304a7d6e660bf783c84bed2dd415141

Depends on D4125

Test Plan:

make check

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D4126