5146 assign ip address to nic (#478)

* Removed duplicate method

* Added assignToIpAddress method to allow assignment of Nic to Ip Address.

* Fixed comment and missing brace

Co-authored-by: Tim Green <tim.green@ukfast.co.uk>

Author: rawveg

src/eCloud/NicClient.php

@@ -33,7 +33,22 @@ public function loadEntity($data)
             $this->apiToFriendly($data, $this->getEntityMap())
         );
     }
-
+  
+    /**
+     * Assigns an IP address with a NIC
+     * @param $id
+     * @param $ipAddressId
+     * @return bool
+     */
+    public function assignIpAddress($id, $ipAddressId)
+    {
+        $response = $this->post(
+            $this->collectionPath . '/' . $id . '/ip-addresses',
+            json_encode([ 'ip_address_id' => $ipAddressId ])
+        );
+        return $response->getStatusCode() == 202;
+    }
+  
     /**
      * Get the IP address records associated with a NIC
      * @param $id