xcp/accessor.py: MountingAccessor.writeFile(): use mode="wb"

Fix MountingAccessor.writeFile() for binary files as checked by
the new test in tests/test_mountingaccessor.py: check_binary_write()

Signed-off-by: Bernhard Kaindl <bernhard.kaindl@cloud.com>

Author: bernhardkaindl

xcp/accessor.py

@@ -161,7 +161,7 @@ def finish(self):
 
     def writeFile(self, in_fh, out_name):
         logger.info("Copying to %s" % os.path.join(self.location, out_name))
-        out_fh = open(os.path.join(self.location, out_name), 'w')
+        out_fh = open(os.path.join(self.location, out_name), "wb")
         return self._writeFile(in_fh, out_fh)
 
     def __del__(self):