smb: client: only use a single wait_queue to monitor smbdirect connection status

There's no need for separate conn_wait and disconn_wait queues.

This will simplify the move to common code, the server code
already a single wait_queue for this.

Cc: Steve French <smfrench@gmail.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: Long Li <longli@microsoft.com>
Cc: linux-cifs@vger.kernel.org
Cc: samba-technical@lists.samba.org
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Steve French <stfrench@microsoft.com>