Arch Linux, Ansible 2.5, Debian 9, coding standards

Many thanks to D4N, TimJDFletcher, pieterlexis, tterranigma, jamatute

Change ansible_pkg_mgr to package #61
Fix type in daemon spelling #62
Use listen: in handler #64
Remove tags from role #63
Add Arch Linux defaults #67
Add StreamLocalBindUnlink option #74
Remove obsolete options from Debian 9 defaults #76
Fix for ansible_virtualization_type not defined in Ansible > 2.5 #78