black_book: add another person to list to show a more complex edit call

Signed-off-by: Zvonimir Fras <zvonimir.fras@sartura.hr>
tests: add: shopping_list (leaf list) example

Signed-off-by: Zvonimir Fras <zvonimir.fras@sartura.hr>
tests: fix namespaces

Signed-off-by: Zvonimir Fras <zvonimir.fras@sartura.hr>
tests: add new examples

Signed-off-by: Zvonimir Fras <zvonimir.fras@sartura.hr>