public List<Integer> getFreePorts(int count) {
		List<Integer> ports = new ArrayList<>();
		for (int i = 0; i < count; i++) {
			ports.add(getFreePort());
		}
		return ports;
	}
Returns a free port numbers on localhost, or less than give count entries if unable to find a
free port.

@return a free port number on localhost, or less than give count entries if unable to find a
        free port
ngrinder-core/src/test/java/org/ngrinder/AbstractMultiGrinderTestBase.java