Windows: Replace "%T" as format string to strftime

Windows: Replace "%T" as format string to strftime

Checkin I18ed36cc4dce9aa354ad1398710ab7db83c814a2 made strftime
much more widespread.  However the %T format is not available on
all platforms and causes (at least) Windows servers to fail on
first attempt to log.  %T is just shorthand to %H:%M:%S so this
checkin just replaces the one with the other.

Change-Id: Ibfff133d9263f5513276d96f3624801fd8ab229e
Reviewed-on: http://gerrit.openafs.org/5364
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>