Rename drbd module implemented in shell as drbd_sh
Add python implementation of drbd module
Do not import tempfile, which is not needed
Create a generic `hosts.yml` task in roles/common/tasks

	new file:   roles/common/tasks/hosts.yml
	new file:   roles/common/templates/etc/hosts.j2
	modified:   roles/gridengine.yml
	deleted:    roles/gridengine/templates/hosts.j2
	modified:   roles/pbs+maui.yml
	deleted:    roles/pbs+maui/templates/hosts.j2
	modified:   roles/slurm.yml
	modified:   roles/slurm/tasks/main.yml
	deleted:    roles/slurm/templates/hosts.j2