nstore: rename public xenstore headers

The xenstore header xs.h is producing conflicts with other software[1].

xs is a too short identifier and does not matche the library. Renaming
the headers to xenstore.h and xenstore_lib.h is the easiest way to make
them easy recognizable and prevent furthe problems.

[1]: http://bugs.debian.org/668550

[ Also update QEMU_TAG, to bring in corresponding change to
qemu-xen-traditional. -iwj ]

Signed-off-by: Bastian Blank <waldi@debian.org>
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>

--HG--
rename : tools/xenstore/xs.h => tools/xenstore/xenstore.h
rename : tools/xenstore/xs_lib.h => tools/xenstore/xenstore_lib.h

tools/python/xen/lowlevel/checkpoint/checkpoint.c

@@ -2,7 +2,7 @@
 
 #include <Python.h>
 
-#include <xs.h>
+#include <xenstore.h>
 #include <xenctrl.h>
 
 #include "checkpoint.h"

tools/python/xen/lowlevel/checkpoint/checkpoint.h

@@ -8,7 +8,7 @@
 #include <time.h>
 
 #include <xenguest.h>
-#include <xs.h>
+#include <xenstore.h>
 
 typedef enum {
     dt_unknown,

tools/python/xen/lowlevel/checkpoint/libcheckpoint.c

@@ -11,7 +11,7 @@
 
 #include <xenctrl.h>
 #include <xenguest.h>
-#include <xs.h>
+#include <xenstore.h>
 
 #include "checkpoint.h"
 

tools/python/xen/lowlevel/xs/xs.c

@@ -30,7 +30,7 @@
 #include <fcntl.h>
 #include <errno.h>
 
-#include "xs.h"
+#include <xenstore.h>
 
 /** @file
  * Python interface to the Xen Store Daemon (xs).