NFSv4: don't set SETATTR for O_RDONLY|O_EXCL

It is unusual to combine the open flags O_RDONLY and O_EXCL, but it appears that libre-office does just that.

[pid 3250] stat("/home/USER/.config", {st_mode=S_IFDIR|0700, st_size=8192, ...}) = 0
[pid 3250] open("/home/USER/.config/libreoffice/4-suse/user/extensions/buildid", O_RDONLY|O_EXCL <unfinished ...>

NFSv4 takes O_EXCL as a sign that a setattr command should be sent, probably to reset the timestamps.

When it was an O_RDONLY open, the SETATTR command does not identify any actual attributes to change.
If no delegation was provided to the open, the SETATTR uses the all-zeros stateid and the request is accepted (at least by the Linux NFS server - no harm, no foul).

If a read-delegation was provided, this is used in the SETATTR request, and a Netapp filer will justifiably claim NFS4ERR_BAD_STATEID, which the Linux client takes as a sign to retry - indefinitely.

So only treat O_EXCL specially if O_CREAT was also given.

index 8bee93469617..4c1c591103b1 100644
@@ -2412,7 +2412,7 @@ static int _nfs4_do_open(struct inode *dir,
 		goto err_free_label;
 	state = ctx->state;
 
-	if ((opendata->o_arg.open_flags & O_EXCL) &&
+	if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
 	    (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
 		nfs4_exclusive_attrset(opendata, sattr);