LU-16751 gss: remove old patches for nfs-utils 1.0.*

LU-16751 gss: remove old patches for nfs-utils 1.0.*

Remove patches for an old version of nfs-utils. Remove the README
that suggests using them. lustre/utils/gss has an entire fork of
nfs-utils utils/gssd directory already.

Also, sk_utils.c shouldn't be executable.

Test-Parameters: trivial
Signed-off-by: Timothy Day <timday@amazon.com>
Change-Id: Ia47193073d2403125043d51db889d0ded41ea9b7
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/51003
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Reviewed-by: Aurelien Degremont <adegremont@nvidia.com>