disk-image-create already does that globally after the guest is
finalized, see lib/img-functions:finalise_base. Thus, there is no need
to remove part of /tmp manually, and no other distro element does that.
Change-Id: Id3b72d41fce258af98b31976ef726d57a0a9fae4
It looks like I installed the cleanup file in the wrong location. Moving it
to the correct location and cleaning some more stuff up should allow for a
much smaller image, currently tested at 300M vs 490M.
Change-Id: I9d0a24b0fe59d4f2d38aa88ba47e4400e0476b46