Update default steam ports and disable mission voting

These default ports tend to work best for both A2 and A3 as recommended
here:

https://community.bistudio.com/wiki/Arma_3_Dedicated_Server#Port_Forwarding

Most Epoch servers only run one mission, so players should not be able
to vote for a mission change.

Server Files/Config-Examples/instance_21_caribou/config.cfg

@@ -2,15 +2,15 @@ hostName = "DayZ Epoch Caribou Server (1.0.6/131129)";
 password = "";
 passwordAdmin = "changeme";
 maxPlayers = 50;
-steamport = 8766;
-steamqueryport = 27016;
+steamport = 2304;
+steamqueryport = 2303;
 
 motd[] = {"DayZ Epoch","Have fun!"};
 motdInterval = 0;
 
 logFile = "server_log.txt";
 voteThreshold = 2;
-voteMissionPlayers = 3;
+voteMissionPlayers = 999;
 timeStampFormat = "short";
 
 vonCodecQuality = 11;