error, not LBER_ERROR.

and Rafal Szczeniak <mimir@samba.org>, with minor cleanups

don't assert(0); apparently, other responses may result from a simple bind (but log them, at least; ITS#4924)

	- after connect(2), if async the connection is in "connecting" state
	- the first time a request is sent, "connecting" conns are polled
		- in case of success, the request is sent
		- in case still connecting, LDAP_X_CONNECTING is returned;
		  clients are expected to retry later
	- the "async" behavior must be explicitly enabled by setting
	  the LDAP_OPT_CONNECT_ASYNC option

"local" connections need work

(with notable exceptions: ignore tests for EINTR which winsock never sets)