- 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_server.hpp

@@ -41,7 +41,6 @@ namespace db
     public:
         server(simulator& simulator,
                const std::string& name,
-               const std::string& id,
                const std::string& address);
         void applier_thread();
         void start_applier();