- 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

Move TLS options into struct ldapoptions.
  Added ldap_int_tls_destroy()
  Added LDAP_OPT_X_TLS_NEWCTX to generate new SSL_CTX

ldap_initializ'ing an LD and before connecting on it. Really all of the
global TLS options belong in the ldapoptions struct, instead of static vars.

LDAP_OPT_X_TLS_CONNECT_CB and LDAP_OPT_X_TLS_CONNECT_ARG
with int (LDAP_TLS_CONNECT_CB) (LDAP *ld, SSL *ssl, SSL_CTX *ctx, void *arg)
To be called whenever the client library allocates a new SSL* handle.

Need to deal with selectinfo...

Need to remove use of deprecated functions.

HEADS UP: May break some Kerberos deployments.

Need to look closely at the memcpy.  (It likely can be eliminated
as well.)