[ENH] conatiner will optional leafs can be added as optional argument to the container.

[Ali-aqrabawi]

instead of :

tc-filters-iproute2
  qdisc-filter enp0s4 0: 
    rule 10 
      protocol ip
      filter flower match src_ip 192.168.1.3
      filter flower actions nat direction egress
      filter flower actions nat old_ip 192.168.1.3
      filter flower actions nat new_ip 192.168.122.47
  dev-filter enp0s4 ingress 
    rule 10 
      protocol ip
      filter flower match dst_ip 192.168.122.47
      filter flower actions nat direction ingress
      filter flower actions nat old_ip 192.168.122.47

we can have:

tc-filters-iproute2
  qdisc-filter enp0s4 0: 
    rule 10 
      protocol ip
      filter flower match src_ip 192.168.1.3
      filter flower actions nat direction egress old_ip 192.168.1.3 new_ip 192.168.122.47
  dev-filter enp0s4 ingress 
    rule 10 
      protocol ip
      filter flower match dst_ip 192.168.122.47
      filter flower actions nat direction ingress old_ip 192.168.122.47
     

conditions to have this:

1. container must only have none-mandatory leafs.
2. container must have more than one leaf.