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>

zdev/include/devnode.h

@@ -0,0 +1,46 @@
+/*
+ * zdev - Modify and display the persistent configuration of devices
+ *
+ * Copyright IBM Corp. 2016, 2017
+ *
+ * s390-tools is free software; you can redistribute it and/or modify
+ * it under the terms of the MIT license. See LICENSE for details.
+ */
+
+#ifndef DEVNODE_H
+#define DEVNODE_H
+
+#include "misc.h"
+
+struct util_list;
+
+typedef enum {
+	BLOCKDEV,
+	CHARDEV,
+	NETDEV,
+} devnode_t;
+
+struct devnode {
+	devnode_t type;
+
+	unsigned int major;
+	unsigned int minor;
+
+	char name[];
+};
+
+struct devnode *devnode_new(devnode_t, unsigned int, unsigned int,
+			    const char *);
+struct devnode *devnode_copy(struct devnode *);
+void devnode_print(struct devnode *, int);
+
+struct devnode *devnode_from_node(const char *, err_t);
+struct devnode *devnode_from_devfile(const char *, const char *, devnode_t);
+struct devnode *devnode_from_path(const char *path);
+
+int devnode_cmp(struct devnode *, struct devnode *);
+int devnode_add_block_from_sysfs(struct util_list *, const char *);
+int devnode_add_net_from_sysfs(struct util_list *, const char *);
+char *devnode_readlink(struct devnode *);
+
+#endif /* DEVNODE_H */