crypto/tls: more Unix root certificate locations
crypto/tls: more Unix root certificate locations

Hard work done by
http://mercurial.selenic.com/wiki/CACertificates

R=golang-dev, gri
CC=golang-dev
http://codereview.appspot.com/5276043

tav/go,tav/go,tav/go,tav/go,tav/go,tav/go,tav/go