lua/dns: handle OPT answers like TXT records

In "tx:answers()" don't attempt to push each OPT as its own string,
instead concatenate into one string like we do with TXT.

The previous method was broken and didn't work anyways, so we're not
breaking something that previously worked.

Ticket: 8843

rust/src/dns/lua.rs

@@ -201,10 +201,14 @@ pub extern "C" fn SCDnsLuaGetAnswerTable(clua: &mut CLuaState, tx: &mut DNSTrans
                 DNSRData::OPT(ref opt) => {
                     if !opt.is_empty() {
                         lua.pushstring("addr");
-                        for option in opt.iter() {
-                            lua.pushstring(&String::from_utf8_lossy(&option.code.to_be_bytes()));
-                            lua.pushstring(&String::from_utf8_lossy(&option.data));
-                        }
+                        let combined = opt
+                            .iter()
+                            .map(|option| {
+                                format!("{}:{}", option.code, String::from_utf8_lossy(&option.data))
+                            })
+                            .collect::<Vec<_>>()
+                            .join(" ");
+                        lua.pushstring(&combined);
                         lua.settable(-3);
                     }
                 }