Fixes (mostly from Buchan Milne) to make all generated files relative

tests/data/slapd-config-undo.conf

tests/data/slapd-dynamic.ldif

tests/data/slapd-translucent-local.conf

tests/data/slapd-valsort.conf

tests/run.in

tests/scripts/all

tests/scripts/defines.sh

tests/scripts/test034-translucent

tests/scripts/test042-valsort

tests/scripts/test049-sync-config

tests/scripts/test050-syncrepl-multimaster

tests/scripts/test051-config-undo