MXS-2243 System tests brings VMs by themselves (#193)

maxscale-system-test changed in order to control test environment by itself.
Every test checks which machines are running, compare with list of needed machines
and start new VMs is they are missing in the running machines list.
Tests are executiong MDBCI commands, MDBCI executable should be in the PATH

maxscale-system-test/nodes.h

@@ -1,5 +1,4 @@
-#ifndef NODES_H
-#define NODES_H
+#pragma once
 
 #include <errno.h>
 #include <string>
@@ -17,16 +16,16 @@ class Nodes
 public:
     Nodes();
 
-    char IP[256][1024];
+    char * IP[256];
     /**
      * @brief  private IP address strings for every backend node (for AWS)
      */
 
-    char IP_private[256][1024];
+    char * IP_private[256];
     /**
      * @brief  IP address strings for every backend node (IPv6)
      */
-    char IP6[256][1024];
+    char * IP6[256];
 
     /**
      * @brief use_ipv6 If true IPv6 addresses will be used to connect Maxscale and backed
@@ -37,7 +36,7 @@ public:
     /**
      * @brief  Path to ssh key for every backend node
      */
-    char sshkey[256][4096];
+    char * sshkey[256];
 
     /**
      * @brief Number of backend nodes
@@ -52,38 +51,43 @@ public:
     /**
      * @brief access_user Unix users name to access nodes via ssh
      */
-    char access_user[256][256];
+    char * access_user[256];
 
     /**
      * @brief access_sudo empty if sudo is not needed or "sudo " if sudo is needed.
      */
-    char access_sudo[256][64];
+    char * access_sudo[256];
 
     /**
      * @brief access_homedir home directory of access_user
      */
-    char access_homedir[256][256];
+    char * access_homedir[256];
 
-    char hostname[256][1024];
+    char * hostname[256];
 
     /**
      * @brief stop_vm_command Command to suspend VM
      */
-    char stop_vm_command[256][1024];
+    char * stop_vm_command[256];
     /**
      *
      * @brief start_vm_command Command to resume VM
      */
-    char start_vm_command[256][1024];
+    char * start_vm_command[256];
 
     /**
      * @brief   User name to access backend nodes
      */
-    char user_name[256];
+    char * user_name;
     /**
      * @brief   Password to access backend nodes
      */
-    char password[256];
+    char * password;
+
+    /**
+     * @brief network_config Content of MDBCI network_config file
+     */
+    std::string network_config;
 
     /**
      * @brief Verbose command output
@@ -174,6 +178,19 @@ public:
      */
     int read_basic_env();
 
+    /**
+     * @brief get_nc_item Find variable in the MDBCI network_config file
+     * @param item_name Name of the variable
+     * @return value of variable
+     */
+    char *get_nc_item(char * item_name);
+
+    /**
+     * @brief get_N Calculate the number of nodes discribed in the _netoek_config file
+     * @return Number of nodes
+     */
+    int get_N();
+
     /**
      * @brief start_vm Start virtual machine
      * @param node Node number
@@ -191,5 +208,3 @@ public:
 private:
     int check_node_ssh(int node);
 };
-
-#endif      // NODES_H