Changes

system.core: expand fields of haProxy

use sumologic guide as a reference here:
https://www.sumologic.com/blog/haproxy-log-format/

Change-Id: I13410fbb0f49898e432cc981a7ad0eb7a3a52791
Signed-off-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/c/tracecompass.incubator/org.eclipse.tracecompass.incubator/+/193916
Tested-by: Trace Compass Bot <tracecompass-bot@eclipse.org>
Tested-by: Marco Miller <marco.miller@ericsson.com>
Reviewed-by: Marco Miller <marco.miller@ericsson.com>