Add minplayers_per_team cvar: fill server with bots to reach this number of...

Add minplayers_per_team cvar: fill server with bots to reach this number of players per team (if bot_number is not enough); it implements #2064
4 jobs for terencehill/minplayers_per_team in 13 minutes and 23 seconds (queued for 1 minute and 19 seconds)
Status Job ID Name Coverage
  Test
passed #151581999
report_cloc

00:02:03

passed #151582000
test_compilation_units

00:06:47

passed #151582001
test_sv_game

00:03:14

passed #151582002
test_sv_unit

00:01:17