core: Add 5 new Events to AuditLog

Added 5 new events to AuditLog:
 - Host memory use over threshold
 - Host cpu use over threshold
 - Host network use over threshold
 - Host free swap memory under threshold
 - Host swap memory use over threshold

Change-Id: Id382c4688bdcf46f7b343ff0661893a97b5dc726
Signed-off-by: Ofri Masad <omasad@redhat.com>