Remove spil.oss@gmail.com from contributors, Add brnrd to committers, PGP keys, news docs

Add myself (brnrd / Bernard Spil) to ports committers

• Add news entry for me as new ports committer
• Add myself to authors.ent
• Remove spil.oss@gmail.com from contrib.additional.xml
• Add brnrd@freebsd.org to contrib.committers.xml
• Move vsevolod from alumni to committers
• Add my PGP key

Submitted by: brnrd@freebsd.org
Approved by: vsevolod (mentor), koobs (mentor)
Differential Revision: https://reviews.freebsd.org/D2647