cifs: fix noisy message on copy_file_range

commit ae4ccca47195332c69176b8615c5ee17efd30c46 upstream.

There are common cases where copy_file_range can noisily
log "source and target of copy not on same server"
e.g. the mv command across mounts to two different server's shares.
Change this to informational rather than logging as an error.

A followon patch will add dynamic trace points e.g. for
cifs_file_copychunk_range

Cc: stable@vger.kernel.org
Reviewed-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>