Comment 14 for bug 959795

I read the man page for udevadm:
       --reload-rules
           Signal udevd to reload the rules files. The udev daemon detects
           changes automatically, this option is usually not needed. Reloading
           rules does not apply any changes to already existing devices.

However, James' error is quite telling:
Jul 31 21:21:46 neptune udevd[409]: specified user 'tss' unknown
Jul 31 21:21:46 neptune udevd[409]: specified group 'tss' unknown

The package is both adding the user group and a udev rule. It may a bug in udev that it isn't doing another lookup if it can't find the group in its cache, but adding a "udevadm control --reload-rules" seems easy enough and ok for an SRU.