Remove implicit initialization of all maxscales

The extra maxscale instances are only started if the test explicitly
requests it.

maxscale-system-test/keepalived.cpp

@@ -22,6 +22,7 @@ int main(int argc, char *argv[])
 
     char * version;
 
+    TestConnections::multiple_maxscales(true);
     TestConnections * Test = new TestConnections(argc, argv);
     Test->set_timeout(10);
 

maxscale-system-test/keepalived_masterdown.cpp

@@ -38,6 +38,7 @@ int main(int argc, char *argv[])
     bool passive;
     char str[1024];
 
+    TestConnections::multiple_maxscales(true);
     TestConnections * Test = new TestConnections(argc, argv);
     //Test->set_timeout(10);
 

maxscale-system-test/testconnections.cpp

@@ -21,6 +21,7 @@ static bool check_nodes = true;
 static bool manual_debug = false;
 static std::string required_repl_version;
 static std::string required_galera_version;
+static bool multiple_maxscales = false;
 }
 
 static void signal_set(int sig, void (*handler)(int))
@@ -55,6 +56,11 @@ void TestConnections::skip_maxscale_start(bool value)
     maxscale::start = !value;
 }
 
+void TestConnections::multiple_maxscales(bool value)
+{
+    maxscale::multiple_maxscales = value;
+}
+
 void TestConnections::require_repl_version(const char *version)
 {
     maxscale::required_repl_version = version;
@@ -648,10 +654,16 @@ void TestConnections::process_template(int m, const char *template_name, const c
 
 void TestConnections::init_maxscales()
 {
-    for (int i = 0; i < maxscales->N; i++)
+    // Always initialize the first MaxScale
+    init_maxscale(0);
+
+    if (maxscale::multiple_maxscales)
+    {
+        for (int i = 1; i < maxscales->N; i++)
         {
             init_maxscale(i);
         }
+    }
 }
 
 void TestConnections::init_maxscale(int m)

maxscale-system-test/testconnections.h

@@ -240,6 +240,9 @@ public:
     /** Skip initial start of MaxScale */
     static void skip_maxscale_start(bool value);
 
+    /** Prepare multiple maxscale instances */
+    static void multiple_maxscales(bool value);
+
     /** Test requires a certain backend version  */
     static void require_repl_version(const char *version);
     static void require_galera_version(const char *version);