auditdistd (again)

My recent upgrading experience led to the installkernel portion of 'make 
kernel' failing on the lack of an auditdistd user, for which 'mergemaster 
-p' was ample workaround.  However, the instructions for "to rebuild 
everything" in UPDATING still have 'mergemaster -p' before installworld 
and after kernel/installkernel.

There is a bug here, but it could be either a documentation bug (fix 
UPDATING) or a code bug (only check UID/GIDs before installworld and not 
installkernel, which only ever uses root:wheel).

Unfortunately, testing code for the latter is somewhat time-consuming.

Pawel mentioned on #bsddev that he had an untested patch for the latter. 
Is there interest in testing that and getting it in the tree?  (Or would 
people prefer to just change UPDATING?)

-Ben