Add test command to dump autogroups data to console.

For testing only, do not merge this to master!

mods/CORE/mcl_autogroup/init.lua

@@ -367,4 +367,26 @@ local function overwrite()
 	end
 end
 
-minetest.register_on_mods_loaded(overwrite)
+minetest.register_on_mods_loaded(overwrite)
+
+-- Test code to demonstrate that on_mods_loaded branch works as expected.
+-- Do not merge this code to master!
+
+minetest.register_chatcommand("dump_autogroup", {
+	params = "",
+	description = "Dump data generated by mcl_autogroup to console",
+	privs = { privs = false },
+	func = function()
+		minetest.log("Registered nodes:")
+		for node_name, node_def in pairs(minetest.registered_nodes) do
+			minetest.log(node_name..": "..dump(node_def))
+		end
+
+		minetest.log("Registered tools:")
+		for tool_name, tool_def in pairs(minetest.registered_tools) do
+			minetest.log(tool_name..": "..dump(tool_def))
+		end
+
+		minetest.log("End dump")
+	end
+})