Revert "NEX-2617 changed in nsswitch.ldap to allow by-host name server resolve during ldapclient configuration"

This reverts commit d976c53a36e6bdbff4a34beeb725cccf7fe10e0c.
NEX-1666 More maintainable ips2deb
NEX-2678 better support for mediators in ips2deb
NEX-2107 SMB2 Notify Change fails to return for directory time change