change cvs loader licence to AGPLv3 because rcsparse is AGPLv3
keep original licences for rlog.py, derived from viewvc and cvs2gitdump
Suggested by vlorentz and zack.
Migrated from D6288 (view on Phabricator)
keep original licences for rlog.py, derived from viewvc and cvs2gitdump
Suggested by vlorentz and zack.
Migrated from D6288 (view on Phabricator)