Manage slurm packages & configs for head node on ansible

[oguya]

Even though we won't be deploying slurm on the head-node on a regular basis, I think its a good idea to manage slurm packages & config files for the head node on ansible. At the moment, only slurm.conf is on ansible.

[oguya]

We can start with the following & increase the list later:

• slurmdbd package & its config file
• devel packages for building bioinformatics software

[oguya]

On commit 561b032, I've added a few build tools required for building most bioinformatics software.