This package provides dhcp_release tool but in files/debs/neutron-common
it was listed to be installed only on Ubuntu Precise.
The same file is also in Nova's packages but there is no restriction to
Ubuntu Precise only there.
So on all Neutron jobs it was fine but on Ironic's job where Nova
wasn't enabled, this package was not installed and caused problems
in Neutron DHCP agent.
Change-Id: Idd0711cfe6d43f21754a2f0c230cd094ea33cb27
Closes-Bug: #1855910
f7a7076fac