configure, create and run LXC application containers

Changes for 0.24 - 2023-08-29T11:40:16Z

• t/02-init.t (UI::Various): added diagnostics for deep recursion on some smokers
• t/06-update.t now skips major part if running below /tmp
• fixed bad hash key in Update.pm
• t/mockup/dpkg-query: hopefully correct fix for smokers where ls is busybox