Disable the use of ticket files by P4API usage of HWS.
If someone were to use, say, the p4 command line client to do some debugging on the same system account as HWS, you might get a ticket file in the default location. In which case the ticket that's used is the one stored, and not the one specified via the header (if the header happens to be incorrect). Which basically opens up access on that account via HWS.