Previously, devstack would disable ironic's cleaning phase if a driver
with "agent" in the name was used. However, we have begun using the IPA
ramdisk for all tests in the gate, which caused cleaning to be run for
the "pxe_ssh" job which therefore fails due to timeouts.
As a result, for now, we need to always disable cleaning.
As a point of record, we should actually be testing cleaning in the
gate. However, running 'shred' on the disks of a nested VM is too slow
and causes the gate to timeout // take too long. Some options have been
discussed for ways to test the callback mechanism but avoid actually
running 'shred' on the disks.
This needs to be revisited.
Change-Id: Id15cf6cc49122b08e557e44871b31a8c0d20b55d
Related-to-Bug: #1517277
2391d4321f