Reduce unnecessary log storage
Previously we were storing the whole contents of /var/tmp/packstack,
which includes all Puppet modules and is unnecessarily filling up
the log server.
Instead, let's store /var/tmp/packstack/latest, where the last
Packstack execution logs are kept. That is really what we need.
Also added 'ip netns' command to logs to help troubleshooting issues
with dhcp agent.
(cherry picked from commit