Description of problem:
When customer is on very slow line (like KS take several hour) the KS tinyurl
(/ty/session) expire in 4 hours. This is hardcoded value in 
./web/modules/rhn/RHN/DB/TinyURL.pm on line 73 as 1/6 day.

Version-Release number of selected component (if applicable):
500

How reproducible:
if you have very slow line

Steps to Reproduce:
1. take slow internet
2. execute KS, which will last 5 hour at least

Actual results:
KS timeout in the middle of downloading

Expected results:
KS do not timeout, or customer can extend timeout value according his needs.