In draft-ietf-ldapext-ldap-c-api-03, there is only
LDAP_OPT_TIMELIMIT defined for ldap search as an
LDAP option.
1. It is desirable to define a new timeout option
for ldap bind.
2. It may be desirable to define different timeout
mechanism. For example, exponential timeout is
useful for specifying bind timeout.
Comments?