This patch introduces standard Redfish virtual media boot
support to ironic.
The patch implements basic boot interface features along with
devstack plugin support for virtual media boot. Functionally,
redfish boot interface supports the same set of features as PXE.
Unlike other virtual media boot implementations (e.g. iLo), this
patch does not require user-built deploy/rescue/boot ISO images
for virtual media boot. Instead, ironic will build necessary images
out of common kernel/ramdisk pair (though user needs to provide
ESP image).
Story: 1526753
Task: 10389
Co-Authored-By: Shivanand Tendulker <stendulker@gmail.com>
Change-Id: I0db0a64c5ccf260f5a0695dbe994af1e11f71517
9fab96fc37