Set FlowHs worker count to 1
Set FlowHs worker count to 1

At this moment FlowHs is not ready to have more than 1 workers because
some objects in massages are not serializable

telstra/open-kilda,telstra/open-kilda,telstra/open-kilda,telstra/open-kilda,telstra/open-kilda,telstra/open-kilda,telstra/open-kilda