ops 2.17 officially deprecated harness and moved some of the internal
paths (that we're not supposed to use, but we do). Update these paths,
but we need to move off harness at some point.
Change-Id: If3921e4f8bdd2c5973e30793267308ac9fa0d951
Signed-off-by: Guillaume Boutry <guillaume.boutry@canonical.com>