Speed up testing

Removed unnecessary sleeps from tests that appear to serve no
purpose. Moveed the kerberos code from the general startup routines to the
kerberos test.

maxscale-system-test/kerberos_setup.cpp

@@ -138,6 +138,11 @@ int main(int argc, char *argv[])
                              "echo select User,Host from mysql.user | mysql -uusr1 -h maxscale.maxscale.test -P 4009", false),
         "Error executing query against Read Connection Slave\n");
 
+    for (int i = 0; i < Test->repl->N; i++)
+    {
+        Test->repl->ssh_node(i, "sudo rm -f /etc/my.cnf.d/kerb.cnf", true);
+    }
+
     int rval = Test->global_result;
     delete Test;
     return rval;