Ansible Role to patch rsyslog.conf

As described in this commit, rsyslog spams the syslog due to an unresolved bug. This Ansible role patches the default rsyslog.conf to correct this issue.

TODO

• Base Travis tests on docker as we cannot seem to be able to restart rsyslog on their machines

• Check that the symptoms are gone:

  sudo grep "rsyslogd-2007: action 'action 17' suspended," /var/log/syslog
  

  must not show a line with a timestamp later than when we applied this patch.