Add changes to ansible (hugepages, munin plugins)

[anayrat]

Just a reminder for me to not forger to add these changes in ansible:

• memory plugin on proxmox host
• Add zfs plugin from munin contrib
• Configure nr_overcommit_hugepages on host
• Maybe over kernel tuning (vm.swappiness =1 ...)
• enable atop and sysstats
• add zfsiostat