Document 'erase_devices_iterations' config option
Document 'erase_devices_iterations' config option

Co-Authored-By: Ramakrishnan G <b8c68ea874797b31e8f7ef15c022c65b89f52544@gmail.com>
Closes-bug: 1511229
Change-Id: I0f15192239ecceb9062df3cae10fd0c5ea4787a4

ionutbalutoiu/ironic,pshchelo/ironic,SauloAislan/ironic,devananda/ironic,dims/ironic,SauloAislan/ironic,ionutbalutoiu/ironic,pshchelo/ironic,bacaldwell/ironic,bacaldwell/ironic,NaohiroTamura/ironic,NaohiroTamura/ironic,dims/ironic,openstack/ironic,openstack/ironic,hpproliant/ironic