executor/impl/chroot: inform rio of test tempdirs.
executor/impl/chroot: inform rio of test tempdirs.

Fortunately nothing was incorrectly relying on this, but for sanity it's quite important that these tests *not* rely on any caches the host may have in the default cache locations.

Signed-off-by: Eric Myhre <2346ad27d7568ba9896f1b7da6b5991251debdf2@exultant.us>

polydawn/repeatr,heavenlyhash/r200,heavenlyhash/r200,polydawn/repeatr