Add a job which runs testinfra for the eavesdrop server. When we
have a per-hostgroup playbook, we will add it to this job too.
The puppet group is removed from the run-base job because the
groups.yaml file is now used to construct groups (as it does
in production) and will construct the group correctly.
The testinfra iptables module may throw an error if it's run
multiple times simultaneously on the same host. To avoid this,
stop using parallel execution.
Change-Id: I1a7bab5c14b0da22393ab568000d0921c28675aa
09b1ff4bc3