Output generic vendor name rather than 'linux'.

The output "linux distribution" doesn't make sense when it's actually
FreeBSD; shuffle the message a little and put the identifier that
comes back from os-release in parenthesis. This makes the output
on FreeBSD consistent and won't scare weird-distro people (they
know it's a linux, right?)
2 jobs for work/adridg/fix-freebsd in 2 minutes and 12 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Test
passed #48304
smoke-test

00:02:12

passed #48303
unit-test

00:00:52