Misc cleanup
NT updates

to struct bervals

Changed sasl_* to use struct bervals.

conn->c_dn,c_ndn, Access->a_dn_pat)

done in do_bind() and there's space in the connection structure for c_ndn
already, just copy it.

LDAP/UDP messages. Slapd marks received CLDAP messages as LDAP_VERSION2.
The client library can generate CLDAP queries if -Protocol 2 is chosen,
otherwise not. LDAPv2 CLDAP cannot query the slapd rootDSE, gets no reply.

Compile with -DLDAP_CONNECTIONLESS to use this code.
For slapd, use "-h cldap://" to listen on UDP.
For ldapsearch, use "-H cldap://" to query on UDP.
Client-side support is very minimal:
  no automatic timeout/retries
  no basedn wildcard expansion on results
  no support for specifying multiple servers at once.

sessions (defaults: 256K and 16M respectively).

with differing anonymous vs authenticated values).

update bdb codes