Review 20968

Russell C. Jackson (Rusty)
Changed to use the standard remove log function on the p4login log. We don't need to keep
anymore than the keeplogs specified number of these logs around. It doesn't matter if they
are all in the last hour or the last seven days. The only need for a p4login log is for
debugging something not working. Anyone that needs long term tracking of logins can turn
on the auth structured log to track the logins.
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