NFSv3/acl: forget acl cache after setattr

Sync of ACL with std permissions fail，We need to forget the ACL cache after setattr.

Reproduction:
#!/bin/bash
touch testfile
cat <<EOF >testfile
#!/bin/bash
echo "Test was executed"
EOF
chmod u=rwx testfile
chmod g=rw- testfile
chmod o=r-- testfile

chacl u::r--,g::rwx,o:rw- testfile
chmod u+w testfile
ls -l testfile
chacl -l testfile

Output：
-rw-rwxrw- 1 root root 0 Mar 28 05:29 testfile
testfile [u::r--,g::rwx,o::rw-]
Signed-off-by: Nchendt.fnst <chendt.fnst@cn.fujitsu.com>
Reviewed-by: NBenjamin Coddington <bcodding@redhat.com>
Reviewed-by: Kinglong Mee <Kinglong Mee>
Signed-off-by: NAnna Schumaker <Anna.Schumaker@Netapp.com>

fs/nfs/nfs3proc.c

@@ -138,8 +138,11 @@ nfs3_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
 		msg.rpc_cred = nfs_file_cred(sattr->ia_file);
 	nfs_fattr_init(fattr);
 	status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
-	if (status == 0)
+	if (status == 0) {
+		if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
+			nfs_zap_acl_cache(inode);
 		nfs_setattr_update_inode(inode, sattr, fattr);
+	}
 	dprintk("NFS reply setattr: %d\n", status);
 	return status;
 }