private static void staticPrintHelpAndExit(String message, Exception e) {
		if (e == null) {
			LOG.error(message);
		} else {
			LOG.error(message, e);
		}
		if (modeParam != null) {
			modeParam.usage();
		}
		System.exit(-1);
	}
print help and exit. This is provided for mocking.

@param message message
@param e       exception
ngrinder-core/src/main/java/org/ngrinder/NGrinderAgentStarter.java