bugtool: Add '-a' option to netstat.
bugtool: Add '-a' option to netstat.

It is valuable to get both listening and non-listening sockets, rather
than non-listening sockets only, for example to verify that proxy
ports are listening. Add the '-a' option to 'netstat' to accomplish
this.

Signed-off-buy: Jarno Rajahalme <0f1ab0ac7dffd9db21aa539af2fd4bb04abc3ad4@covalent.io>

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