(ITS#8746) Add ldap_pvt_tls_connect()

[ondra@openldap.org]

Full_Name: Ondrej Kuznik
Version: master
OS: 
URL: ftp://ftp.openldap.org/incoming/Ondrej-Kuznik-20170928-ldap_pvt_tls_connect.patch
Submission from: (NULL) (82.10.24.68)


There is no way to reuse the libldap implementation to set up a client TLS layer
on a Sockbuf. This exposes ldap_int_tls_connect through ldap_pvt.h as
ldap_pvt_tls_connect.

Needless to say, skipping the full libldap infrastructure means it is up to the
user to do certificate verification etc. when using this API.