- Initialize member cluster ID only on connection to cluster and forget

it on disconnect.
 - Don't rely on own index from the view because the view may come from
   another member (IST/SST), instead always determine own index from own ID.

Refs codership/wsrep-lib#13

dbsim/db_simulator.cpp

@@ -109,7 +109,6 @@ void db::simulator::start()
                         std::make_unique<db::server>(
                             *this,
                             name_os.str(),
-                            id_os.str(),
                             address_os.str()))));
         if (it.second == false)
         {