[ldaputils,ldapparser] correctly compute "deleted" users (closes #2542083) * in ldaputils.py, removal of an unneeded method (checking existence of an object in the ldap, but not using the configuration filters) * in the ldapparser, memoize the (filtered) search so as to serve both .process and .is_deleted * add a non regression test for the 'user-filter' source config entry + deletion

#! /bin/sh -e
 
case "$1" in
    purge)
	rm -rf /etc/cubicweb.d/
	rm -rf /var/log/cubicweb/
	rm -rf /var/lib/cubicweb/
    ;;
esac
 
#DEBHELPER#
 
exit 0