Update ironic.config.sample
Update ironic.config.sample

Update outdated config example

Change-Id: Ib8ed9b977b00b3b1dc54d763572bd4d3bf55dd69

SauloAislan/ironic,bacaldwell/ironic,pshchelo/ironic,bacaldwell/ironic,SauloAislan/ironic,NaohiroTamura/ironic,NaohiroTamura/ironic,devananda/ironic,openstack/ironic,openstack/ironic,pshchelo/ironic