Bootstrap worker logs with zuul information

In an effort to help us default failures, add some information about
zuul-launcher and worker nodes into the logs.

We also update zuul_log to optionally support lists, so we can pass
more then 1 line into it. We default to raw now to make ansible 2.1
happier.

Change-Id: Icb4d20e3ef0166eb43b1b45aec049040813b5d37
Signed-off-by: Paul Belanger <pabelanger@redhat.com>
2 files changed