Add keyName as an option when creating servers

Author: kunalp

src/Compute/v2/Api.php

@@ -163,6 +163,7 @@ public function postServer()
                 'availabilityZone'   => $this->params->availabilityZone(),
                 'networks'           => $this->params->networks(),
                 'blockDeviceMapping' => $this->params->blockDeviceMapping(),
+				'keyName'            => $this->params->keyName()
             ]
         ];
     }

src/Compute/v2/Params.php

@@ -369,4 +369,14 @@ public function networkLabel()
             'required' => true,
         ];
     }
+
+	public function keyName()
+	{
+		return [
+			'type'        => self::STRING_TYPE,
+			'required'    => false,
+			'sentAs'      => 'key_name',
+			'description' => 'The key name',
+		];
+	}
 }