datapath/iptables: wait until acquisition xtables lock is done
datapath/iptables: wait until acquisition xtables lock is done

This guarantees iptables interactions are not run concurretly with other
programs, e.g. kube-proxy.

More info: https://git.netfilter.org/iptables/commit/?id=93587a04d0f2511e108bbc4d87a8b9d28a5c5dd8

Signed-off-by: André Martins <bc9800b9d52a24cce72a73dd528afed53f10e5fc@cilium.io>

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