smb: client/smbdirect: replace SMBDIRECT_SOCKET_CONNECTING with more detailed states

smb: client/smbdirect: replace SMBDIRECT_SOCKET_CONNECTING with more detailed states

The process of reaching a functional connection represented by
SMBDIRECT_SOCKET_CONNECTED, is more complex than using a single
SMBDIRECT_SOCKET_CONNECTING state.

This will allow us to remove a lot of special variables and
completions in the following commits.

Cc: Steve French <smfrench@gmail.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: Long Li <longli@microsoft.com>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
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>