lxc_ram: fix shellcheck issues
lxc_ram: simplify quoting
refactor: code of areastack option is hard to understand
- reviewed on https://github.com/munin-monitoring/contrib/pull/738#pullrequestreview-5187474- split two conditional branches to simple if-else code
rename option to 'env.areastack'
Add support for Ubuntu 14.04
add new option 'env.stack_usage' to lxc_ram
Category Tree: reduce number of categories
Added handling of multiple lxc.network.veth.pair-lines
typofixes - https://github.com/vlajos/misspell_fixer
Suspicious sections:plugins/mail/postfix_mail_stats recieved.labelplugins/nginx/nginx_vhost_traffic
added lxc plugins from https://github.com/vajtsz/munin-plugins