Expect error loading configs (#388)

Rethrow error loading configs as StartupError as these are most likely a
result of user error.

packages/ctl/ctl.js

@@ -1082,7 +1082,7 @@ async function startControl() {
 			await controlConfig.init();
 
 		} else {
-			throw err;
+			throw new libErrors.StartupError(`Failed to load ${args.config}: ${err.message}`);
 		}
 	}
 

packages/master/master.js

@@ -274,7 +274,7 @@ async function initialize() {
 			await parameters.masterConfig.init();
 
 		} else {
-			throw err;
+			throw new libErrors.StartupError(`Failed to load ${parameters.masterConfigPath}: ${err.message}`);
 		}
 	}
 

packages/slave/slave.js

@@ -1777,7 +1777,7 @@ async function startSlave() {
 			await slaveConfig.init();
 
 		} else {
-			throw err;
+			throw new libErrors.StartupError(`Failed to load ${args.config}: ${err.message}`);
 		}
 	}
 
@@ -1887,6 +1887,14 @@ I           version of clusterio.  Expect things to break. I
 		if (err instanceof libErrors.AuthenticationFailed) {
 			logger.fatal(err.message);
 
+		} else if (err instanceof libErrors.StartupError) {
+			logger.fatal(`
++-----------------------------------+
+| Unable to to start clusterioslave |
++-----------------------------------+
+${err.stack}`
+			);
+
 		} else if (err instanceof libErrors.PluginError) {
 			logger.fatal(`
 ${err.pluginName} plugin threw an unexpected error