Remove midonet job
Remove midonet job

As it's no longer relevant after FWaaS v1 removal. [1]

[1] I4e440c854e5aa11193d38946e659481f4fefded2

Related-Bug: #1814625
Change-Id: I913d87974e6b1e2ca1dda06a8b8518df88464607

openstack/neutron-fwaas,openstack/neutron-fwaas