Add missing hash_partition_exponent config option
Add missing hash_partition_exponent config option

Add the missing hash_partition_exponent option to ironic.conf.sample

Change-Id: Id737afe8b9da9997908fa3163cb3416117100aa6

ramineni/myironic,rackerlabs/ironic,SauloAislan/ironic,debayanray/ironic_backup,bacaldwell/ironic,ionutbalutoiu/ironic,dims/ironic,Tan0/ironic,naterh/ironic,hpproliant/ironic,SauloAislan/ironic,NaohiroTamura/ironic,openstack/ironic,openstack/ironic,faizan-barmawer/openstack_ironic,rdo-management/ironic,froyobin/ironic,redhat-openstack/ironic,pshchelo/ironic,naototty/vagrant-lxc-ironic,NaohiroTamura/ironic,naototty/vagrant-lxc-ironic,supermari0/ironic,ionutbalutoiu/ironic,Tehsmash/ironic,devananda/ironic,JioCloud/ironic,bacaldwell/ironic,pshchelo/ironic,varunarya10/ironic,dims/ironic