Add tests from develop

Added tests from develop. The test results need to be modified for 2.0.

maxscale-system-test/mxs922_scaling.cpp

@@ -0,0 +1,93 @@
+/**
+ * @file mxs922_scaling.cpp MXS-922: Server scaling test
+ *
+ */
+
+#include "testconnections.h"
+#include "config_operations.h"
+
+static bool running = true;
+
+void* query_thread(void *data)
+{
+    TestConnections *test = static_cast<TestConnections*>(data);
+
+    MYSQL *mysql = test->open_rwsplit_connection();
+    my_bool yes = true;
+    mysql_options(mysql, MYSQL_OPT_RECONNECT, &yes);
+
+    while (running)
+    {
+        execute_query_silent(mysql, "SELECT @@server_id");
+        execute_query_silent(mysql, "SELECT last_insert_id()");
+    }
+
+    mysql_close(mysql);
+
+    return NULL;
+}
+
+
+int main(int argc, char *argv[])
+{
+    TestConnections *test = new TestConnections(argc, argv);
+    Config config(test);
+
+    config.create_all_listeners();
+    config.create_monitor("mysql-monitor", "mysqlmon", 500);
+
+    int num_threads = 5;
+    int iterations = test->smoke ? 5 : 25;
+    pthread_t threads[num_threads];
+
+    test->tprintf("Creating client threads");
+
+    for (int i = 0; i < num_threads; i++)
+    {
+        pthread_create(&threads[i], NULL, query_thread, test);
+    }
+
+
+    test->tprintf("Adding and removing servers for %d seconds.", iterations * test->repl->N);
+
+    for (int x = 0; x < iterations; x++)
+    {
+        for (int i = 0; i < test->repl->N; i++)
+        {
+            if ((x + i) % 2 == 0)
+            {
+                config.create_server(i);
+                config.add_server(i);
+            }
+            else
+            {
+                config.remove_server(i);
+                config.destroy_server(i);
+            }
+
+            sleep(1);
+        }
+    }
+
+    running = false;
+
+    for (int i = 0; i < num_threads; i++)
+    {
+        pthread_join(threads[i], NULL);
+    }
+
+    /** Make sure the servers exist before checking that connectivity is OK */
+    for (int i = 0; i < test->repl->N; i++)
+    {
+        config.create_server(i);
+        config.add_server(i);
+    }
+
+    sleep(1);
+
+    test->check_maxscale_alive();
+    test->check_log_err("Fatal", false);
+    int rval = test->global_result;
+    delete test;
+    return rval;
+}