I'm using Nginx-modsecurity, and I need fail2ban (0.9.7 - Yum - CentOS 7.x) to filter that log.
And I don't need IPv6.
The only modsecurity related is just apache-modsecurity. So I add this filter.
If something wrong, please let me know. Thanks

Before submitting your PR, please review the following checklist:

• [ x] CHOOSE CORRECT BRANCH: if filing a bugfix/enhancement
  against 0.9.x series, choose master branch
• [x ] CONSIDER adding a unit test if your PR resolves an issue
• [x ] LIST ISSUES this PR resolves
• [x ] MAKE SURE this PR doesn't break existing tests
• [x ] KEEP PR small so it could be easily reviewed.
• [x ] AVOID making unnecessary stylistic changes in unrelated code
• [x ] ACCOMPANY each new failregex for filter X with sample log lines
  within fail2ban/tests/files/logs/X file