cilium/cmd: Add TablePrinter helper
cilium/cmd: Add TablePrinter helper

To avoid using tabwriter in the same way several times in different
commands, this utility is able to print any table with two columns,
using data represented as map[string][]string.

Signed-off-by: Michal Rostecki <82ebf970c69340aebb770c3853be5fd96a3eb584@suse.com>

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