Refs #2790 - permit amd64 diskless creation/booting. Keep i386 as the default...

Refs #2790 - permit amd64 diskless creation/booting.  Keep i386 as the default diskless image for now.
1 job for master in 23 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Test
passed #683
gitpull

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