Revert "UBUNTU: SAUCE: (namespace) Bypass sget() capability check for nfs"

BugLink: http://bugs.launchpad.net/bugs/1612135

This reverts commit d15123a5 in
order to replace it with the more generic upstream fix.
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Colin King <colin.king@canonical.com>
Acked-by: Brad Figg <brad.figg@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

fs/nfs/super.c

@@ -2559,8 +2559,7 @@ struct dentry *nfs_fs_mount_common(struct nfs_server *server,
 			sb_mntdata.mntflags |= MS_SYNCHRONOUS;
 
 	/* Get a superblock - note that we may end up sharing one that already exists */
-	s = sget_userns(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags,
-			&init_user_ns, &sb_mntdata);
+	s = sget(nfs_mod->nfs_fs, compare_super, nfs_set_super, flags, &sb_mntdata);
 	if (IS_ERR(s)) {
 		mntroot = ERR_CAST(s);
 		goto out_err_nosb;