(ITS#5886) epoll issues with lost connections

Full_Name: Quanah Gibson-Mount Version: 2.4.13 OS: Linux 2.6 URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (75.111.29.239)

When OpenLDAP is built on a system with epoll instead of select, it loses the ability to properly clean up those connections, as for epoll this is a separate event.

slapd needs to be fixed to handle this case when epoll is used. It's fairly trivial to trigger it, simply write a script that does lots of searches and closes the connection without unbinding. This will cause slapd to eventually hang and stop accepting connections for a few seconds.