Remove duplicated _fetch_images function
Remove duplicated _fetch_images function

This patch removes the _fetch_images function from the agent driver and
changes the driver to use the identical function found in deploy_utils.py

Change-Id: Ic206258f65a88c0f7557b405c7de425cfd01900f
Closes-Bug: 1350594

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