Dmitry Tantsur d3737b23bd Bring boot_iso/deploy_iso handling in iLO closer to Redfish ...

The iLO version is, as far as I remember, the oldest implementation of
virtual media in Ironic. Since then a few cool feature have been
developed in this area, but they are limited to the code using
image_utils (e.g. Redfish). The iLO boot interface only uses image_utils
when an ISO needs to be built, but not when one is provided. This patch
changes that.

There are a few visible side-effects to that:
1) file:/// images are now supported
2) ramdisk_image_download_source is now supported
3) the default caching behavior changes to caching http:// links
   (previously they were passed to the BMC directly).
4) glance images are supported with backends other than swift

Story: #2008987
Task: #42638
Change-Id: I23c21188776c511eddcdaf66a222ce64876678e2

2021-07-07 18:51:13 +02:00

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