MXS-3410 Rename Mariadb_nodes::flush_hosts() to prepare_for_test()

The function does more than simply executes "FLUSH HOSTS". Also
change return type to bool as that is what it has returned.

system-test/auth_change_user_loop.cpp

@@ -109,7 +109,8 @@ int main(int argc, char* argv[])
         pthread_join(parall_traffic1[j], NULL);
     }
     Test->tprintf("All threads are finished");
-    Test->repl->flush_hosts();
+    // TODO: Just a simple flush_hosts() may be sufficient.
+    Test->repl->prepare_for_test();
 
     Test->tprintf("Change user to '%s' in order to be able to DROP user", Test->maxscales->user_name);
     Test->set_timeout(30);

system-test/maxtest/include/maxtest/mariadb_nodes.hh

@@ -354,10 +354,10 @@ public:
     std::vector<std::string> get_all_server_ids_str();
 
     /**
-     * @brief Execute 'mysqladmin flush-hosts' on all nodes
-     * @return 0 in case of success
+     * @brief Flush hosts, adjust settings, remove anonymous users, etc.
+     * @return True in case of success, false otherwise.
      */
-    int flush_hosts();
+    bool prepare_for_test();
 
     /**
      * @brief Execute query on all nodes

system-test/maxtest/src/mariadb_nodes.cc

@@ -82,7 +82,7 @@ bool Mariadb_nodes::setup()
 {
     read_env();
     truncate_mariadb_logs();
-    flush_hosts();
+    prepare_for_test();
     close_active_connections();
 
     return true;
@@ -874,7 +874,7 @@ bool Mariadb_nodes::fix_replication()
             if (check_replication() == 0)
             {
                 cout << "Replication is fixed" << endl;
-                rval = flush_hosts();
+                rval = prepare_for_test();
             }
             else
             {
@@ -1028,7 +1028,7 @@ std::vector<int> Mariadb_nodes::get_all_server_ids()
     return rval;
 }
 
-bool do_flush_hosts(MYSQL* conn)
+bool do_prepare_for_test(MYSQL* conn)
 {
     int local_result = 0;
 
@@ -1088,11 +1088,11 @@ bool do_flush_hosts(MYSQL* conn)
     return local_result == 0;
 }
 
-int Mariadb_nodes::flush_hosts()
+bool Mariadb_nodes::prepare_for_test()
 {
     if (this->nodes[0] == NULL && (this->connect() != 0))
     {
-        return 1;
+        return false;
     }
 
     bool all_ok = true;
@@ -1100,7 +1100,7 @@ int Mariadb_nodes::flush_hosts()
 
     for (int i = 0; i < N; i++)
     {
-        std::packaged_task<bool(MYSQL*)> task(do_flush_hosts);
+        std::packaged_task<bool(MYSQL*)> task(do_prepare_for_test);
         futures.push_back(task.get_future());
         std::thread(std::move(task), nodes[i]).detach();
     }

system-test/mxs321.cpp

@@ -107,7 +107,8 @@ int main(int argc, char* argv[])
     /** Create connections to readconnroute slave */
     create_and_check_connections(Test, 3);
 
-    Test->repl->flush_hosts();
+    // TODO: Just a simple flush_hosts() may be sufficient.
+    Test->repl->prepare_for_test();
 
     int rval = Test->global_result;
     delete Test;

system-test/mxs548_short_session_change_user.cpp

@@ -83,7 +83,8 @@ int main(int argc, char** argv)
 
     test.tprintf("Flushing backend hosts");
     test.set_timeout(60);
-    test.repl->flush_hosts();
+    // TODO: Just a simple flush_hosts() may be sufficient.
+    test.repl->prepare_for_test();
 
     test.tprintf("Dropping tables and users");
     test.set_timeout(60);

system-test/mxs559_block_master.cpp

@@ -87,7 +87,8 @@ int main(int argc, char* argv[])
 
     test.stop_timeout();
     test.tprintf("Make sure that replication works");
-    test.repl->flush_hosts();
+    // TODO: Just a simple flush_hosts() may be sufficient.
+    test.repl->prepare_for_test();
     if (!test.repl->fix_replication())
     {
         test.tprintf("Replication is broken!");

system-test/rwsplit_readonly.cpp

@@ -278,7 +278,7 @@ int main(int argc, char* argv[])
     Test->repl->disconnect();
 
     /** Clean up test environment */
-    Test->repl->flush_hosts();
+    Test->repl->prepare_for_test();
     int rval = Test->global_result;
     delete Test;
     return rval;

system-test/rwsplit_readonly_stress.cpp

@@ -112,7 +112,7 @@ int main(int argc, char* argv[])
     }
 
     /** Clean up test environment */
-    Test->repl->flush_hosts();
+    Test->repl->prepare_for_test();
     int rval = Test->global_result;
     delete Test;
     return rval;