Add Octavia logs to filter regex
Add Octavia logs to filter regex

Add 'o-' to SUPPORTS_SEV regex to enable Octavia logs
support in filter.

Change-Id: Ie29830320fd6c4524d151b291d836aa0c6be71cc

openstack-infra/os-loganalyze,openstack-infra/os-loganalyze,openstack-infra/os-loganalyze