The PXE Annaconda dhcp cleanup test triggers the dhcp_factory clean
up code by default. Which is good! Problem is, if you don't have
dnsmasq installed, things blow up.
Specifically becuase it was called in such a way where it was
trying to clean up dhcp records for nodes. Example:
ironic.common.exception.InstanceDeployFailure: An error occurred
after deployment, while preparing to reboot the node
1be26c0b-03f2-4d2e-ae87-c02d7f33c123: [Errno 2] No such file
or directory:
'/etc/dnsmasq.d/hostsdir.d/ironic-52:54:00:cf:2d:31.conf'
Instead of executing that far, we just now check that we did, indeed
call for dhcp cleanup.
This was discovered while trying to fix unit test race conditions
and random failures in CI.
Change-Id: Id7b1e2e9ca97aeff786e9df06f35eca67dd36b58
c392814ca8