Issue 9502 - Implement TCP_USER_TIMEOUT in meta and asyncmeta

Nadezhda Ivanovarequested to merge
nivanova/openldap:tcp_user_timeout into master

This is the initial implementation of LDAP_OPT_TCP_USER_TIMEOUT libldap option, and it's use by the meta and asyncmeta backends.

Edited by Nadezhda Ivanova

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