crush/CrushWrapper: simplify get_full_location_ordered()

Just ascend the hierarchy; it is much less complicated.

Signed-off-by: Sage Weil <sage@inktank.com>
(cherry picked from commit 746069ee62c74ecf04ed45988029d5c3382a38d2)
crush: fix get_full_location_ordered

This should return -ENOENT when an id is not present.  Broken by
746069ee62c74ecf04ed45988029d5c3382a38d2.

Signed-off-by: Sage Weil <sage@inktank.com>
(cherry picked from commit d4f07cd90b4037964a18e5c05a3cc5ddd73fb393)