The log extension is responsible for retrieving logs from the system,
if journalctl is present the logs will come from it, otherwise we
fallback to getting the logs from the /var/log directory + dmesg logs.

In the coreos ramdisk, we need to bind mount /run/log in the container
so the IPA service can have access to the journal.

For the tinyIPA ramdisk, the logs from IPA are now being redirected to
/var/logs/ironic-python-agent.log instead of only going to the default
stdout.

Inspector now shares the same method of collecting logs, extending its
capabilities for non-systemd systems.

Partial-Bug: #1587143
Change-Id: Ie507e2e5c58cffa255bbfb2fa5ffb95cb98ed8c4