Issue 50425 - Add jemalloc LD_PRELOAD to systemd drop-in file
The previous fix (7466be3) for jemalloc inclusion stopped installing
template-initconfig rendering ds-setup.pl unusable.
This fix moves the template-initconfig into -legacy-tools
to make it available only when necessary.
Relates: https://pagure.io/389-ds-base/issue/50425
Reviewed by: Viktor, Ludwig, Thierry, Mark (thanks!)