Discrepancy between server-side and client-side SW clock

[rmarquis]

In SW mode, the console will print some clock information after each round, such as:

• Clock set to: 12:34 (1st round)
• Objective reached at 12:12 (original: 12:34) or Objective NOT reached in time (12:34) (2nd round)

While working on #495, I observed a weird discrepancy between the clock calculation in SW mode when the time difference between the 2 rounds is typically small.

Here's a screenshot to illustrate, with some debug values:

• display the delta time in msec (would otherwise be shown as 0:00)
• [original time][original time in msec][actual time][actual time in msec]

The server time (in console) displays Objective NOT reached in time (allies failed), while the client side shows that allies won the game (set by CS_MULTI_MAPWINNER).

Notes:

• changes in show delta time in debriefing in stopwatch mode #495 only display the time, but do not modify how the winning side is computed. This looks like a vanilla issue.
• the time used for delta time display are computed on the server
• delta time is surprisingly displayed as a negative number, which indicates it is the client side that is wrong (as opposed to some error due to int/float rounding on the console message)
• when displayed in msec, time is a multiple of 50 msec, due to 1/sv_fps default value I guess

Lastly, I am not sure of the range of time that results in such discrepancy (the lowest delta time I got while testing that was good was 1300msec, but I got some discrepancy with -350 msec too). But at first sight, I'd say around ~1 sec, maybe less).