LU-14739 quota: nodemap squashed root cannot bypass quota

LU-14739 quota: nodemap squashed root cannot bypass quota

When root on client is squashed via a nodemap's squash_uid/squash_gid,
its IOs must not bypass quota enforcement as it normally does without
squashing.
So on client side, do not set OBD_BRW_FROM_GRANT for every page being
used by root. And on server side, check if root is squashed via a
nodemap and remove OBD_BRW_NOQUOTA.

Lustre-change: https://review.whamcloud.com/43988
Lustre-commit: a4fbe7341baf12c00c6048bb290f8aa26c05cbac

Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: I95b31277273589e363193cba8b84870f008bb07a
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Reviewed-on: https://review.whamcloud.com/45485
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>