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/Makefile

@@ -0,0 +1,13 @@
+# Common definitions
+include ../common.mak
+
+all:
+	$(MAKE) -C src
+
+install: all
+	$(MAKE) -C src install
+	$(MAKE) -C man install
+	$(MAKE) -C dracut install
+
+clean:
+	$(MAKE) -C src clean