LU-13730 lod: don't confuse stale with primary flag

LU-13730 lod: don't confuse stale with primary flag

there can be few in-sync replicas which are not primry.

Lustre-commit: 571f3cf1115973d0fdaf6d5244bfeee230b52989
Lustre-change: https://review.whamcloud.com/42003

Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Change-Id: I8b984463a2665bc88f2f76247df5366a68d74ea6
Reviewed-by: Yingjin Qian <qian@ddn.com>
Reviewed-by: John L. Hammond <jhammond@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/43448
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>