PROBLEM:  	(Patch ID: OSF415-410100)
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The current version of /usr/sbin/adduser is slow when /etc/passwd has a
large number of entries. Futhermore it does not allow duplicate UIDs to
be assigned to users. This version of /usr/sbin/adduser allows duplicate
UID's to be assigned to users, has a faster algorithm for finding the next
unassigned UID, and uses /usr/sbin/useradd to do the actual work of creating
the user account.  This results in a significant performance improvement
when /etc/passwd has a large number of entries.