pkg/node: Register node on the background
pkg/node: Register node on the background

It allows to run cilium without blocking while
a kvstore connection is set up.

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

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