Replace the deprecated rsyslog config style
Replace the deprecated rsyslog config style

The old style has been deprecated for time:
http://www.rsyslog.com/doc/v8-stable/compatibility/v7compatibility.html#omruleset-and-discard-action-are-deprecated
TrivialFix

Change-Id: I70fa065f5fbd686ddb8f4134bb93c08c7af00365

mrangana/kolla,intel-onp/kolla,toby82/kolla,limamauricio/mykolla,stackforge/kolla,tonyli71/kolla,limamauricio/mykolla,mandre/kolla,toby82/kolla,openstack/kolla,toby82/kolla,limamauricio/mykolla,negronjl/kolla,stackforge/kolla,openstack/kolla,mandre/kolla,mrangana/kolla,negronjl/kolla,rahulunair/kolla,dardelean/kolla-ansible,tonyli71/kolla,negronjl/kolla,GalenMa/kolla,rahulunair/kolla,dardelean/kolla-ansible,coolsvap/kolla,mandre/kolla,GalenMa/kolla,nihilifer/kolla,coolsvap/kolla,dardelean/kolla-ansible,nihilifer/kolla,coolsvap/kolla,intel-onp/kolla,stackforge/kolla