usermanager, mod_auth_internal_hashed: Support metadata when disabling a user

This allows us to store a time, actor, comment and/or reason why an account
was disabled, which seems a generally useful thing to support.

core/usermanager.lua

@@ -163,12 +163,12 @@ local function enable_user(username, host)
 	return ret, err;
 end
 
-local function disable_user(username, host)
+local function disable_user(username, host, meta)
 	local method = hosts[host].users.disable;
 	if not method then return nil, "method not supported"; end
-	local ret, err = method(username);
+	local ret, err = method(username, meta);
 	if ret then
-		prosody.events.fire_event("user-disabled", { username = username, host = host });
+		prosody.events.fire_event("user-disabled", { username = username, host = host, meta = meta });
 	end
 	return ret, err;
 end

plugins/mod_auth_internal_hashed.lua

@@ -126,9 +126,10 @@ function provider.enable(username)
 	return accounts:set(username, account);
 end
 
-function provider.disable(username)
+function provider.disable(username, meta)
 	local account = accounts:get(username);
 	account.disabled = true;
+	account.disabled_meta = meta;
 	account.updated = os.time();
 	return accounts:set(username, account);
 end