Issue with validation of boot and deploy interfaces

This issue was identified while testing the driver composition code changes across the ilo drivers. When the hardware type is "ilo" and boot and deploy interfaces are pxe and agent respectively, it was observed that validation fails with the error message saying "ilo_deploy_iso" is not provided as part of the driver_info. This is incorrect since for pxe boot the driver uses "deploy_kernel" and "deploy_ramdisk" and does not require to provide "ilo_deploy_iso". This issue can be easily reproducible.