Add myself (brnrd / Bernard Spil) to committers docs

• Add myself and vsevolod (mentor) to committers-ports.dot
• Add koobs and vsevolod as mentors to committers-ports.dot

Submitted by: brnrd@freebsd.org
Approved by: vsevolod (mentor), koobs (mentor)
Differential Revision: https://reviews.freebsd.org/D2648