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/Parameters.php

@@ -26,7 +26,6 @@ class Parameters implements ParametersInterface
         'scheme' => 'tcp',
         'host' => '127.0.0.1',
         'port' => 6379,
-        'timeout' => 5.0,
     );
 
     /**