Fix test failures and add debug logging

Fixed test failures, increased some of the timeouts, added extra info
level logging into rwsplit to help debug the test failures.

server/modules/routing/readwritesplit/rwsplit_route_stmt.cc

@@ -228,6 +228,7 @@ bool RWSplitSession::route_single_stmt(GWBUF *querybuf)
                 // We need to wait until the session commands are executed
                 m_expected_responses++;
                 m_query_queue = gwbuf_append(m_query_queue, gwbuf_clone(querybuf));
+                MXS_INFO("Queuing query until '%s' completes session command", target->name());
             }
             else
             {