Skip tests that cannot be run

If a test requires Galera but it is not available, it is now skipped. All
tests that explicitly use the `test.galera` member as well as all tests
that use a Galera configuration now require that Galera is present.

maxscale-system-test/binary_ps.cpp

@@ -5,9 +5,8 @@
 
 int main(int argc, char** argv)
 {
-
     TestConnections test(argc, argv);
-    char server_id[test.galera->N][1024];
+    char server_id[test.repl->N][1024];
 
     test.repl->connect();
 

maxscale-system-test/bug676.cpp

@@ -14,6 +14,7 @@
 
 int main(int argc, char* argv[])
 {
+    TestConnections::require_galera(true);
     TestConnections test(argc, argv);
 
     test.set_timeout(30);

maxscale-system-test/galera_priority.cpp

@@ -163,6 +163,7 @@ int simple_failover(TestConnections* test)
 
 int main(int argc, char** argv)
 {
+    TestConnections::require_galera(true);
     TestConnections* test = new TestConnections(argc, argv);
     test->galera->verbose = false;
     int rval1 = 0;

maxscale-system-test/lots_of_rows.cpp

@@ -11,6 +11,7 @@
 
 int main(int argc, char* argv[])
 {
+    TestConnections::require_galera(true);
     TestConnections* Test = new TestConnections(argc, argv);
     char sql[10240];
 

maxscale-system-test/mxs1110_16mb.cpp

@@ -12,6 +12,7 @@
 int main(int argc, char* argv[])
 {
     TestConnections::skip_maxscale_start(true);
+    TestConnections::require_galera(true);
     TestConnections* Test = new TestConnections(argc, argv);
     Test->maxscales->stop_maxscale(0);
     Test->set_timeout(60);

maxscale-system-test/mxs1476.cpp

@@ -61,6 +61,7 @@ void do_test(TestConnections& test, int master, int slave)
 
 int main(int argc, char** argv)
 {
+    TestConnections::require_galera(true);
     TestConnections test(argc, argv);
     test.galera->stop_node(2);
     test.galera->stop_node(3);

maxscale-system-test/mxs1751_available_when_donor_crash.cpp

@@ -15,6 +15,7 @@
 
 int main(int argc, char* argv[])
 {
+    TestConnections::require_galera(true);
     TestConnections test(argc, argv);
 
     for (int i = 0; i < 2; i++)

maxscale-system-test/mxs1980_blr_galera_server_ids.cpp

@@ -410,6 +410,7 @@ int main(int argc, char* argv[])
 {
     mxb::Log log(MXB_LOG_TARGET_STDOUT);
 
+    TestConnections::require_galera(true);
     TestConnections::skip_maxscale_start(true);
     TestConnections test(argc, argv);
 

maxscale-system-test/mxs244_prepared_stmt_loop.cpp

@@ -17,6 +17,7 @@
 
 int main(int argc, char* argv[])
 {
+    TestConnections::require_galera(true);
     TestConnections* Test = new TestConnections(argc, argv);
     long unsigned iterations = (Test->smoke) ? 1000 : 25000;
     int r = (Test->smoke) ? 1 : 3;

maxscale-system-test/mxs314.cpp

@@ -10,6 +10,7 @@ using namespace std;
 
 int main(int argc, char** argv)
 {
+    TestConnections::require_galera(true);
     TestConnections test(argc, argv);
     string query = "select 1";
 

maxscale-system-test/mxs564_big_dump.cpp

@@ -46,6 +46,7 @@ void query_thread(TestConnections* t)
 
 int main(int argc, char* argv[])
 {
+    TestConnections::require_galera(true);
     TestConnections test(argc, argv);
 
     int master = test.maxscales->find_master_maxadmin(test.galera);

maxscale-system-test/pers_01.cpp

@@ -58,6 +58,7 @@ void check_pers_conn(TestConnections* Test, int pers_conn_expected[], char* serv
 
 int main(int argc, char* argv[])
 {
+    TestConnections::require_galera(true);
     TestConnections* Test = new TestConnections(argc, argv);
     int pers_conn_expected[4];
     int galera_pers_conn_expected[4];

maxscale-system-test/pers_02.cpp

@@ -18,6 +18,7 @@
 
 int main(int argc, char* argv[])
 {
+    TestConnections::require_galera(true);
     TestConnections* Test = new TestConnections(argc, argv);
 
     Test->set_timeout(60);

maxscale-system-test/script.cpp

@@ -90,6 +90,7 @@ void test_script_monitor(TestConnections* Test, Mariadb_nodes* nodes, char* expe
 
 int main(int argc, char* argv[])
 {
+    TestConnections::require_galera(true);
     TestConnections* Test = new TestConnections(argc, argv);
     Test->set_timeout(100);
 

maxscale-system-test/testconnections.cpp

@@ -17,6 +17,8 @@
 #include "testconnections.h"
 
 using namespace mxb;
+using std::cout;
+using std::endl;
 
 namespace maxscale
 {
@@ -27,6 +29,7 @@ static bool manual_debug = false;
 static std::string required_repl_version;
 static std::string required_galera_version;
 static bool restart_galera = false;
+static bool require_galera = false;
 static bool multiple_maxscales = false;
 }
 
@@ -83,6 +86,11 @@ void TestConnections::require_galera_version(const char* version)
     maxscale::required_galera_version = version;
 }
 
+void TestConnections::require_galera(bool value)
+{
+    maxscale::require_galera = value;
+}
+
 void TestConnections::restart_galera(bool value)
 {
     maxscale::restart_galera = value;
@@ -249,6 +257,12 @@ TestConnections::TestConnections(int argc, char* argv[])
             test_dir);
     setenv("ssl_options", ssl_options, 1);
 
+    if (no_galera && maxscale::require_galera)
+    {
+        cout << "Galera not in use, skipping test" <<endl;
+        exit(0);
+    }
+
     repl = new Mariadb_nodes("node", test_dir, verbose);
     if (!no_galera)
     {

maxscale-system-test/testconnections.h

@@ -263,6 +263,9 @@ public:
     static void require_repl_version(const char* version);
     static void require_galera_version(const char* version);
 
+    /** Require that a backend is present*/
+    static void require_galera(bool value);
+
     /**
      * @brief Specify whether galera should be restarted.
      *