ITS#2401 support tests for dynamically loaded backends

tests/Makefile.in

tests/data/slapd-acl.conf

tests/data/slapd-dnssrv.conf

tests/data/slapd-glue.conf

tests/data/slapd-master.conf

tests/data/slapd-nis-master.conf

tests/data/slapd-passwd.conf

tests/data/slapd-pw.conf

tests/data/slapd-ref-slave.conf

tests/data/slapd-referrals.conf

tests/data/slapd-repl-master.conf

tests/data/slapd-repl-slave.conf

tests/data/slapd-repl-submaster.conf

tests/data/slapd-repl-subslave.conf

tests/data/slapd-schema.conf

tests/data/slapd.conf

tests/scripts/all

tests/scripts/args.sh

tests/scripts/conf.sh

tests/scripts/test000-rootdse