crush: rebuild shadow tree on "crush create-or-move/move"

crush: rebuild shadow tree on "crush create-or-move/move"

This patch solves the problem below:

./bin/ceph osd crush move osd.0 root=foo rack=foo-rack host=foo-host
moved item id 0 name 'osd.0' to location {host=foo-host,rack=foo-rack,root=foo} in crush map

 ./bin/ceph osd crush rule create-replicated foo-rule foo host ssd
Error EINVAL: root foo has no devices with class ssd

Signed-off-by: xie xingguo <xie.xingguo@zte.com.cn>