rearrange slurm roles a bit

roles/slurm-common/templates/slurm.initd.j2

roles/slurm-common/templates/slurm_setup.sh.j2

roles/slurm-sql/tasks/main.yml

roles/slurm/defaults/main.yml

roles/slurm/handlers/main.yml

roles/slurm/tasks/main.yml

roles/slurm/templates/munge_key.j2

roles/slurm/templates/slurm-vpn.conf.j2

roles/slurm/templates/slurm.conf.j2

roles/slurmdb-config/handlers/main.yml

roles/slurmdb-config/tasks/main.yml

roles/slurmdb-config/templates/slurmdbd.conf.j2

roles/slurmdb-config/templates/slurmdbd.initd.j2