Get rid of hardcoded pathes for stubdom and hotplug scripts

- Have the buid system generate a file which exports the install paths
   for the hotplug scripts and stubdom / stubdom-dm
- Move file generation code from tools/python/Makefile into a gmake
   macro
  in Config.mk to avoid maintenance of three duplicates each with its
   own
  tweaks and bugs
- Export gmake variables into ioemu as shell variables
  for upcoming ioemu patches
- Do above as a gmake macro to avoid maintenance of several duplicates
- Adjust hotplug scripts to find the right xen binaries from the
  install directory
- Adjust stubdom-dm to use the install directories

Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>

tools/python/Makefile

@@ -14,20 +14,11 @@ I18NSRCFILES = $(shell find xen/xm/ -name '*.py')
 CATALOGS = $(patsubst %,xen/xm/messages/%.mo,$(LINGUAS))
 NLSDIR = $(SHAREDIR)/locale
 XENPATH = "xen/util/path.py"
-  
-.PHONY: build buildpy genpath
-genpath:
-	rm -f $(XENPATH)
-	echo "SBINDIR=\"$(SBINDIR)\"" >> $(XENPATH)
-	echo "BINDIR=\"$(BINDIR)\"" >> $(XENPATH)
-	echo "LIBEXEC=\"$(LIBEXEC)\"" >> $(XENPATH)
-	echo "LIBDIR=\"$(LIBDIR)\"" >> $(XENPATH)
-	echo "SHAREDIR=\"$(SHAREDIR)\"" >> $(XENPATH)
-	echo "PRIVATE_BINDIR=\"$(PRIVATE_BINDIR)\"" >> $(XENPATH)
-	echo "XENFIRMWAREDIR=\"$(XENFIRMWAREDIR)\"" >> $(XENPATH)
-	echo "XEN_CONFIG_DIR=\"$(XEN_CONFIG_DIR)\"" >> $(XENPATH)
-	echo "XEN_SCRIPT_DIR=\"$(XEN_SCRIPT_DIR)\"" >> $(XENPATH)
 
+genpath-target = $(call buildmakevars2file,$(XENPATH))
+$(eval $(genpath-target))
+
+.PHONY: build buildpy
 buildpy: genpath 
 	CC="$(CC)" CFLAGS="$(CFLAGS)" $(PYTHON) setup.py build