Preload the user before the request starts, to ensure we have it when the request is over for the log file. If we don't preload before dispatching, a database connection may not be available at the end of the request if nobody else has asked for the CurrentUser object. Change-Id: Ic82a4b9d15705a20b0425b292fa14b78b934d97f Signed-off-by: Shawn O. Pearce <sop@google.com>