tools: use XEN_LIB_STORED instead of /var/lib/xenstored

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Use XEN_RUN_DIR instead of /var/run/xen

Also remove duplicate XEN_RUN_DIR from m4/paths.m4.
Fix XEN_RUN_DIR expansion in toplevel Makefile

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Move systemd paths to Paths.mk

Every path should be in Paths.mk.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Include Paths.mk in toplevel Makefile to fix uninstall

make uninstall references various variable paths.
If they are not set it may wipe /*.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
rerun autogen.sh

Signed-off-by: Olaf Hering <olaf@aepfle.de>