LU-17200 mdt: check object's locality

LU-17200 mdt: check object's locality

remote object can disappear while we're getting an ldlm lock for
it. we can't check object's attributes before we're sure it does
exist. so check object's locality first.

Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Change-Id: I86ad0f3e7c38b0dce51a9fd836ba2293b210fe4f
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/52716
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Mikhail Pershin <mpershin@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>