Add unit test for ilo_deploy _configure_vmedia_boot()
Add unit test for ilo_deploy _configure_vmedia_boot()

This patch adds unit test which is a reflection of iRMC virtual media
code review comment [1] to ilo virtual media reference source code.
It was advised that _configure_vmedia_boot could use it's own specific
unit test.

https://review.openstack.org/#/c/181807/7

Change-Id: I0970bdfdd4d0eb3ce68f8fe17b99ef00554fda59

Tan0/ironic,bacaldwell/ironic,NaohiroTamura/ironic,pshchelo/ironic,openstack/ironic,pshchelo/ironic,dims/ironic,ionutbalutoiu/ironic,NaohiroTamura/ironic,SauloAislan/ironic,bacaldwell/ironic,devananda/ironic,SauloAislan/ironic,dims/ironic,redhat-openstack/ironic,openstack/ironic,ionutbalutoiu/ironic,naterh/ironic,hpproliant/ironic