Remove "timeout" as a default parameter in Connection\Parameters.

Falling back to a default timeout values should be done by the connection class
as it is an implementation detail that may vary depending on the backend.

src/Connection/WebdisConnection.php

@@ -33,7 +33,7 @@ use Predis\Response\Status as StatusResponse;
  *  - scheme: must be 'http'.
  *  - host: hostname or IP address of the server.
  *  - port: TCP port of the server.
- *  - timeout: timeout to perform the connection.
+ *  - timeout: timeout to perform the connection (default is 5 seconds).
  *  - user: username for authentication.
  *  - pass: password for authentication.
  *
@@ -117,10 +117,11 @@ class WebdisConnection implements NodeConnectionInterface
     private function createCurl()
     {
         $parameters = $this->getParameters();
+        $timeout = (isset($parameters->timeout) ? (float) $parameters->timeout : 5.0) * 1000;
 
         $options = array(
             CURLOPT_FAILONERROR => true,
-            CURLOPT_CONNECTTIMEOUT_MS => $parameters->timeout * 1000,
+            CURLOPT_CONNECTTIMEOUT_MS => $timeout,
             CURLOPT_URL => "{$parameters->scheme}://{$parameters->host}:{$parameters->port}",
             CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
             CURLOPT_POST => true,