blackbox should not run as root

[#82340478]
bump blackbox remote_syslog2 syslog

Submodule src/github.com/concourse/blackbox 8664286..d360a98:
  > README already has an example
  > allow setting a custom hostname
  > switch out for a new syslog client
  > rearrange imports
  > don't panic if line from tailer is nil
  > use constant in tailer seek position
  > add blackbox integration test
Submodule src/github.com/papertrail/remote_syslog2 0000000...4b1f6de (new submodule)
Submodule src/github.com/ziutek/syslog 0000000...0e395df (new submodule)
set hostname for blackbox bosh jobs
bump blackbox

Submodule src/github.com/concourse/blackbox d360a98..55968c4:
  > don't hide useful errors