slapd playbook: update separating directories and files

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
update runner script

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
Add readme

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>