auto/config: change a few defaults for transitappliance.org
auto/config: change a few defaults for transitappliance.org

* Use the US Debian mirror
* Point the browser to transitappliance.org (this will change soon)
* Set the hostname to transitapp

Signed-off-by: Scott Garman <f826a775b4411e0c76e2b388cc0a780ae73c4341@zenlinux.com>

ScottGarman/Webconverger-TransitAppliance,ScottGarman/Webconverger-TransitAppliance