use ubuntu
aufs is not supported by mainline kernel, use mhddfs instead
Merge branch 'master' into ubuntu

Conflicts:
	roles/samba/tasks/main.yml
use lineinfile directly
install and use powernap

Conflicts:
	Vagrantfile
	bootstrap.yml
update bootstrap.yml
restart/enable sec and smartmontools on ubuntu
fix samba vagrant host config
powernap, monitor disks by-uuid
restructured samba role
fix handler for smartmontools
mv kernel update to common
fix ansible.cfg, disable host_key_checking
some more basic packages, ethernet optimization

@see https://gareth.halfacree.co.uk/2014/02/tuning-an-hp-proliant-microserver
add missing library patch
move reload udev to handlers
fix powernap, crashes when no keyboard attached
fix hdd spindown
change order of tasks in common for unrar