MFH: r452687

www/h2o: update to 2.2.3

• resolve security vulnerabilities via new release
• ensure custom config files are loaded by re-ordering h2o rc.d script
• clean up options while we are here
• full changelog: https://github.com/h2o/h2o/releases/tag/v2.2.3

PR: 222281
Reported by: freebsd@get-experience.com
Reviewed by: jrm (mentor)
Approved by: jrm (mentor)
Security: CVE-2017-10868
Security: CVE-2017-10869
Differential Revision: https://reviews.freebsd.org/D12619

Approved by: ports-secteam (implicit)