Remove kombu as a dependency for Ironic
Remove kombu as a dependency for Ironic

It was required before oslo.messaging now kombu is not used anymore in
our code database.

Change-Id: If9c52c4fce52b913e404cd41a81d187986041df0

hpproliant/ironic,naototty/vagrant-lxc-ironic,bacaldwell/ironic,rdo-management/ironic,Tan0/ironic,SauloAislan/ironic,pshchelo/ironic,devananda/ironic,rackerlabs/ironic,openstack/ironic,supermari0/ironic,openstack/ironic,naototty/vagrant-lxc-ironic,pshchelo/ironic,NaohiroTamura/ironic,ionutbalutoiu/ironic,ramineni/myironic,naterh/ironic,ionutbalutoiu/ironic,froyobin/ironic,NaohiroTamura/ironic,Tehsmash/ironic,redhat-openstack/ironic,SauloAislan/ironic,dims/ironic,bacaldwell/ironic,dims/ironic