[AOLSERVER] rollfmt config directive for ns/server/server-name/module/nslog

[Jim Wilcoxson]

This is not documented in 3.4 but is present and appears (from limited
testing) to work.  It was in 2.3.3 also.  Takes a date string like:

ns_param   rollfmt         "%Y-%m-%d-%H:%M"

and will rename the access.log file using this pattern.

Jim