Improve log collection
Improve log collection

Logs from test runs on systemd systems were not being
collected properly. Allow logs to be collected from
systemd if available and fall back to the upstart
location. Also, only collect information from netstat
and iptables if present.

Change-Id: I000c3d0c7d576eeb4ab051f68a6fef8a83dc06fb
Closes-Bug: #1470128

EntropyWorks/bifrost,EntropyWorks/bifrost,bcornec/bifrost,openstack/bifrost,bcornec/bifrost,openstack/bifrost