public void addFirstOwner(@Nonnull final JID targetUserAddress) {
        owners.add( targetUserAddress.asBareJID() );
    }
Adds a new user to the list of owners. The user is the actual creator of the room. Only the
MultiUserChatServer should use this method. Regular owners list maintenance MUST be done
through {@link #addOwner(JID jid, Affiliation)}.

@param targetUserAddress The (real) JID of the user to add as owner.
xmppserver/src/main/java/org/jivesoftware/openfire/muc/MUCRoom.java