Fix for issue 2575.

The problem is that there is a timeout when reading the monitoring informations 
on the server and the code did not handle this properly.

I have made the method Utils.getMessage to handle properly the case when a Topol
ogyCacheException has not a Throwable cause.  In addition to that the method ret
urns a specific message when a timeout occurs.  Finally the timeout thresold has
 been risen from 10 to 30 seconds to be able to read the topology.