Added conditional server salt setting for Rust

We don't have the range, but it doesn't prevent users from setting a salt to a known value on an existing server, that they can know running rcon command: server.salt

Fixes #1364

Also fixed an unneeded space line 22.

lgsm/config-default/config-lgsm/rustserver/_default.cfg

@@ -19,7 +19,8 @@ servername="Rust"
 maxplayers="50"
 
 # Advanced Start Settings
-seed="" #  default random; range : 1 to 2147483647 ; used to change or reproduce a procedural map
+seed="" # default random; range : 1 to 2147483647 ; used to change or reproduce a procedural map
+salt="" # default random; range : unknown range ; used to recover a known setting from an existing map
 worldsize="3000" # default 3000; range : 1000 to 6000 ; map size in meters
 saveinterval="300" # Auto-save in seconds
 tickrate="30" # default 30; range : 15 to 100
@@ -34,7 +35,14 @@ else
 	# Keep randomness of the number if not set
 	conditionalseed=""
 fi
-parms="-batchmode +server.ip ${ip} +server.port ${port} +server.tickrate ${tickrate} +server.hostname \"${servername}\" +server.identity \"${servicename}\" ${conditionalseed} +server.maxplayers ${maxplayers} +server.worldsize ${worldsize} +server.saveinterval ${saveinterval} +rcon.web ${rconweb} +rcon.ip ${ip} +rcon.port ${rconport} +rcon.password \"${rconpassword}\" -logfile \"${gamelogdate}\""
+if [ -n "${salt}" ]; then
+	# If set, then add to start parms
+	conditionalsalt="+server.salt ${salt}"
+else
+	# Keep randomness of the number if not set
+	conditionalsalt=""
+fi
+parms="-batchmode +server.ip ${ip} +server.port ${port} +server.tickrate ${tickrate} +server.hostname \"${servername}\" +server.identity \"${servicename}\" ${conditionalseed} ${conditionalsalt} +server.maxplayers ${maxplayers} +server.worldsize ${worldsize} +server.saveinterval ${saveinterval} +rcon.web ${rconweb} +rcon.ip ${ip} +rcon.port ${rconport} +rcon.password \"${rconpassword}\" -logfile \"${gamelogdate}\""
 }
 
 #### LinuxGSM Settings ####