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/module.h

@@ -0,0 +1,31 @@
+/*
+ * 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 MODULE_H
+#define MODULE_H
+
+#include "exit_code.h"
+#include "misc.h"
+
+struct setting_list;
+struct attrib;
+
+void module_exit(void);
+
+void module_load_suppress(int);
+
+bool module_loaded(const char *);
+exit_code_t module_load(const char *, const char **, struct setting_list *,
+			err_t);
+exit_code_t module_get_params(const char *, struct attrib **,
+			      struct setting_list **);
+bool module_set_params(const char *, struct setting_list *);
+void module_try_load_once(const char *, const char *);
+
+#endif /* MODULE_H */