Correctly identify as iTop in cURL requests (#652)

* Correctly identify as iTop in cURL requests (with configuration option)

application/utils.inc.php

@@ -1944,7 +1944,7 @@ SQL;
 			CURLOPT_HEADER         => false,    // don't return the headers in the output
 			CURLOPT_FOLLOWLOCATION => true,     // follow redirects
 			CURLOPT_ENCODING       => "",       // handle all encodings
-			CURLOPT_USERAGENT      => "spider", // who am i
+			CURLOPT_USERAGENT      => static::GetConfig()->Get('http.request.user_agent'), // who am i
 			CURLOPT_AUTOREFERER    => true,     // set referer on redirect
 			CURLOPT_CONNECTTIMEOUT => 120,      // timeout on connect
 			CURLOPT_TIMEOUT        => 120,      // timeout on response

core/config.class.inc.php

@@ -1795,6 +1795,13 @@ class Config
 			'source_of_value'     => '',
 			'show_in_conf_sample' => false,
 		],
+		'http.request.user_agent' => [
+			'type'                => 'string',
+			'description'         => 'HTTP request user agent, use this to set a custom agent on external requests.',
+			'default'             => ITOP_APPLICATION.'/'.ITOP_VERSION,
+			'source_of_value'     => '',
+			'show_in_conf_sample' => false,
+		]
 	];
 
 	public function IsProperty($sPropCode)