Disk Image Export Wizard - Remove QED as an disk image export option

Problem/Justification

  • If this is a dead format, should it still be allowed?
  • it is dead format. for those 5 people that use it, they can convert this themselves, pushing a dead format is not a good idea.
  • https://wiki.qemu.org/Features/QED

Impact
Why should TrueNAS allow the export of a dead disk format. I can understan allowing import, but even that there is an argument not to allow it.

User Story
n/a