[p4] Stop Creating default accounts

[Robert Cowham]

> I had as the first line
> 
> Write user * * -//...
> 
> Thinking that this would take away all rights but I guess 
> that is what is causing it...

A comment:

For exclude mappings order is important and they affect lines above them in
the table. Thus it is unnecessary to remove all rights with the first line,
since until you have a line or two giving people some rights they don't have
any. (You can't take away what they don't yet have!). From a protections
point of view it doesn't hurt but is superfluous, and as you discovered has
unintended side effects.

Robert