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>

Makefile

@@ -0,0 +1,48 @@
+ARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ -e s/arm.*/arm/ -e s/sa110/arm/)
+
+# Include common definitions
+include common.mak
+
+LIB_DIRS = libvtoc libu2s libutil libzds libdasd libvmdump libccw
+TOOL_DIRS = zipl zdump fdasd dasdfmt dasdview tunedasd \
+	   tape390 osasnmpd qetharp ip_watcher qethconf scripts zconf \
+	   vmconvert vmcp man mon_tools dasdinfo vmur cpuplugd ipl_tools \
+	   ziomon iucvterm hyptop cmsfs-fuse qethqoat zfcpdump zdsfs cpumf \
+	   systemd hmcdrvfs cpacfstats zdev dump2tar zkey
+SUB_DIRS = $(LIB_DIRS) $(TOOL_DIRS)
+
+all: $(TOOL_DIRS)
+clean: $(TOOL_DIRS)
+install: $(TOOL_DIRS)
+
+#
+# For simple "make" we explicitly set the MAKECMDGOALS to "all".
+#
+ifeq ($(MAKECMDGOALS),)
+MAKECMDGOALS = all
+endif
+
+#
+# We have to build the libraries before the tools are built. Otherwise
+# the tools would trigger parallel "make -C" builds for libraries in
+# case of "make -j".
+#
+# MAKECMDGOALS contains the list of goals, e.g. "clean all". We use
+# "foreach" to generate a ";" separated list of "make -C <target>".
+# For example the the expansion for "make clean all" is:
+#
+# $(MAKE) -C $@ [..] clean ;  $(MAKE) -C $@ [...] all ;
+#
+# This ensures that the commandline targets are serialized and also "make -j"
+# works as expected, e.g. "make clean all -j 20".
+#
+
+$(TOOL_DIRS): $(LIB_DIRS)
+	$(foreach goal,$(MAKECMDGOALS), \
+		$(MAKE) -C $@ TOPDIR=$(TOPDIR) ARCH=$(ARCH) $(goal) ;)
+.PHONY: $(TOOL_DIRS)
+
+$(LIB_DIRS):
+	$(foreach goal,$(MAKECMDGOALS), \
+		$(MAKE) -C $@ TOPDIR=$(TOPDIR) ARCH=$(ARCH) $(goal) ;)
+.PHONY: $(LIB_DIRS)