Ever since destroys handling was moved to MDTs we need to
move waiting for destroys completion to MDTs as well.
Change-Id: I31440ec048b960206a903387d7050aa13e45008d
Signed-off-by: Oleg Drokin <green@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/43870
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>