test/helpers: add HostDockerNetwork constant
test/helpers: add HostDockerNetwork constant

Signed-off-by: Ian Vernon <57a33a5496950fec8433e4dd83347673459dcdfc@cilium.io>

cilium/cilium,tgraf/cilium,tgraf/cilium,cilium/cilium,cilium/cilium,scanf/cilium,eloycoto/cilium,tklauser/cilium,tklauser/cilium,eloycoto/cilium,tklauser/cilium,scanf/cilium,scanf/cilium,tklauser/cilium,tklauser/cilium,tgraf/cilium,tgraf/cilium,michi-covalent/cilium,scanf/cilium,michi-covalent/cilium,eloycoto/cilium,eloycoto/cilium,eloycoto/cilium,tgraf/cilium,michi-covalent/cilium,michi-covalent/cilium,cilium/cilium,michi-covalent/cilium,cilium/cilium,cilium-team/cilium,tgraf/cilium,scanf/cilium,scanf/cilium,cilium-team/cilium,eloycoto/cilium,scanf/cilium,eloycoto/cilium