fix: yang namespaces

Signed-off-by: Zvonimir Fras <zvonimir.fras@sartura.hr>
freenetconf-plugins: add shopping-list (leaf-list) example plugin

Signed-off-by: Zvonimir Fras <zvonimir.fras@sartura.hr>
plugins: add house-lockdown (custom rpc) example

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