host: Add support for using the host network interfaces

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com>
host: Use host network namespace for etcd/discoverd

This is a prerequisite for enabling routable per-job IPs.

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com>
test/runner: Add title to builds page

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com>
Merge pull request #495 from flynn/host-networking

Add host networking support
Merge pull request #496 from flynn/ci-title

test/runner: Add title to builds page
test: Track test durations

Signed-off-by: Lewis Marshall <lewis@lmars.net>