Significantly speed up testing server boot (#2846)

Dramatically speeds up boot with testing (MC_TICKLIMIT_INIT > 100) configs; stoplag() would penalize procs that go over 100% tick-usage by delaying them further. This is not required during server boot & the lobby, and resulted in significantly longer boot times.

This PR ports a fix from /tg/ that forces stoplag() only sleep 1 tick if it sleeps during server boot, as well as adjusting the example config to be more suited for testing.

code/controllers/configuration.dm

@@ -46,7 +46,7 @@ var/list/gamemode_cache = list()
 	var/continous_rounds = 0			// Gamemodes which end instantly will instead keep on going until the round ends by escape shuttle or nuke.
 	var/allow_Metadata = 0				// Metadata is supported.
 	var/popup_admin_pm = 0				//adminPMs to non-admins show in a pop-up 'reply' window when set to 1.
-	var/Ticklag = 0.9
+	var/Ticklag = 0.4
 	var/Tickcomp = 0
 	var/list/resource_urls = null
 	var/antag_hud_allowed = 0			// Ghosts can turn on Antagovision to see a HUD of who is the bad guys this round.
@@ -286,11 +286,6 @@ var/list/gamemode_cache = list()
 					src.votable_modes += M.config_tag
 	src.votable_modes += "secret"
 
-#ifdef UNIT_TEST
-	fastboot = TRUE
-	world.log << "UNIT_TEST present. Forcing fastboot on."
-#endif 
-
 /datum/configuration/proc/load(filename, type = "config") //the type can also be game_options, in which case it uses a different switch. not making it separate to not copypaste code - Urist
 	var/list/Lines = file2list(filename)
 
@@ -827,6 +822,7 @@ var/list/gamemode_cache = list()
 
 				if("fastboot")
 					fastboot = TRUE
+					world.log << "Fastboot is ENABLED."
 
 				else
 					log_misc("Unknown setting in configuration: '[name]'")

code/controllers/subsystems/initialization/misc_late.dm

@@ -37,6 +37,8 @@
 
 	shuttle_controller.setup_shuttle_docks()
 
+	admin_notice("<span class='notice'><b>Fastboot is enabled; some features may not be available.</b></span>", R_DEBUG)
+
 	..(timeofday, TRUE)
 
 /proc/resort_all_areas()