XEP-0410: set not-in-the-room error condition to not-acceptable

XEP-0410 demands that. This changes the error condition for all
pings to the room, even those which aren’t self-pings, if the
sender is not joined.

The conditions of XEP-0410 were based on observing existing
implementations.

src/bridge/bridge.cpp

@@ -743,7 +743,7 @@ void Bridge::send_irc_participant_ping_request(const Iid& iid, const std::string
   IrcChannel* chan = irc->get_channel(iid.get_local());
   if (!chan->joined || !this->is_resource_in_chan(iid.to_tuple(), from.resource))
     {
-      this->xmpp.send_stanza_error("iq", to_jid, from_jid, iq_id, "cancel", "not-allowed",
+      this->xmpp.send_stanza_error("iq", to_jid, from_jid, iq_id, "cancel", "not-acceptable",
                                     "", true);
       return;
     }

tests/end_to_end/__main__.py

@@ -1543,14 +1543,14 @@ if __name__ == '__main__':
                              "<iq type='get' from='{jid_one}/{resource_one}' id='first_ping' to='#nil%{irc_server_one}/{nick_one}'><ping xmlns='urn:xmpp:ping' /></iq>"),
                      # Immediately receive an error
                      partial(expect_stanza,
-                             "/iq[@from='#nil%{irc_server_one}/{nick_one}'][@type='error'][@to='{jid_one}/{resource_one}'][@id='first_ping']/error/stanza:not-allowed"),
+                             "/iq[@from='#nil%{irc_server_one}/{nick_one}'][@type='error'][@to='{jid_one}/{resource_one}'][@id='first_ping']/error/stanza:not-acceptable"),
 
                      # Send a ping to ourself, in a muc where we are, but not this resource
                      partial(send_stanza,
                              "<iq type='get' from='{jid_one}/{resource_two}' id='first_ping' to='#foo%{irc_server_one}/{nick_one}'><ping xmlns='urn:xmpp:ping' /></iq>"),
                      # Immediately receive an error
                      partial(expect_stanza,
-                             "/iq[@from='#foo%{irc_server_one}/{nick_one}'][@type='error'][@to='{jid_one}/{resource_two}'][@id='first_ping']/error/stanza:not-allowed"),
+                             "/iq[@from='#foo%{irc_server_one}/{nick_one}'][@type='error'][@to='{jid_one}/{resource_two}'][@id='first_ping']/error/stanza:not-acceptable"),
                  ]),
                 Scenario("self_ping_on_real_channel",
                  [