oom-killer module

Daemon which apply correct `oom_killer` flags to services. 

Should contains:
- `bin/script` to apply configuration (read config files, search for service PID, apply oom-killer flag)
- cron job: scheduled `bin/script` runs
- `/etc/oomkiller/conf.d/*`

Resources:
* http://backdrift.org/how-to-create-oom-killer-exceptions

@njam @ppp0 wdyt? I am not sure how to approach this problem. part of https://github.com/cargomedia/bipbip/pull/70 and https://github.com/cargomedia/puppet-cargomedia/issues/585