Added optional target paramater for creating instance

This ensures the instance is created where the user intended when
in clustering mode instead of where LXD allocates it!

Author: turtle0x1

src/Endpoint/InstaceBase.php

@@ -255,7 +255,7 @@ public function unfreeze($name, $timeout = 30, $force = true, $stateful = false,
      * @param bool $wait Wait for operation to finish
      * @return object
      */
-    public function create($name, array $options, $wait = false, array $requestHeaders = [])
+    public function create($name, array $options, $wait = false, array $requestHeaders = [], string $target = "")
     {
         $source = $this->getSource($options);
 
@@ -281,6 +281,10 @@ public function create($name, array $options, $wait = false, array $requestHeade
             "project"=>$this->client->getProject()
         ];
 
+        if (!empty($target)) {
+            $config["target"] = $target;
+        }
+
 
         $response = $this->post($this->getEndpoint(), $opts, $config, $requestHeaders);