Add a 30 second timeout for requests
Add a 30 second timeout for requests

After 30 seconds of inactivity from the server, the request will
be aborted and Gertty will switch to offline mode.

Change-Id: I32d65ad07f54e4624eaf826d35a5a19c5a88e6ac

stackforge/gertty,aspiers/gertty,openstack/gertty