convert multiple scripts to python3

remove rocheck, with new munin all filesystems are readonly

update changelog and update standards version

exclude any filesystem under /run

fix rocheck plugin

munin-plugins-fsinf Debian release 2017-01-17-1

munin-plugins-fsinf Debian release 2016-10-04-1

fix websocket detection

munin-plugins-fsinf Debian release 2016-07-08-1

also exclude /run/user/ fs, they change depending on who is logged in