Initial s390-tools-2.0.0 import

This commit is based on the s390-tools-1.39.0 version.

Changes on top of s390-tools-1.39.0:

 - Add MIT license to all source files
 - Add LICENSE file
 - Transform REAMDE to README.md (markdown)
 - Add AUTHORS.md file
 - Add CONTRIBUTING.md file
 - Move changelog from README to CHANGELOG.md file

Reviewed-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>

libutil/util_base_example.c

@@ -0,0 +1,38 @@
+/**
+ * util_base_example - Example program for util_base
+ *
+ * Copyright 2017 IBM Corp.
+ *
+ * s390-tools is free software; you can redistribute it and/or modify
+ * it under the terms of the MIT license. See LICENSE for details.
+ */
+
+//! [code]
+#include <stdio.h>
+
+#include "lib/util_base.h"
+
+#define INDENTATION	24
+
+const char *msg =
+"There is a theory which states that if ever anybody discovers exactly "
+"what the Universe is for and why it is here, it will instantly disappear "
+"and be replaced by something even more ...\n"
+"\n"
+"            ... bizarre\n"
+"            ... and inexplicable.\n"
+"\n"
+"There is another theory which states that this has already happened.";
+
+/*
+ * Demonstrate util_base functions
+ */
+int main(void)
+{
+	printf("TEST: util_print_indented(msg, %d)\n", INDENTATION);
+	printf("----------------------------------\n");
+	printf("%-*s", INDENTATION, "Douglas Adams:");
+	util_print_indented(msg, INDENTATION);
+	return EXIT_SUCCESS;
+}
+//! [code]