remotefilelog: use %d to format an int

Differential Revision: https://phab.mercurial-scm.org/D5656

hgext/remotefilelog/basepack.py

@@ -270,9 +270,9 b' class versionmixin(object):'
                 # only affect this instance
                 self.VERSION = version
             elif self.VERSION != version:
-                raise RuntimeError('inconsistent version: %s' % version)
+                raise RuntimeError('inconsistent version: %d' % version)
         else:
-            raise RuntimeError('unsupported version: %s' % version)
+            raise RuntimeError('unsupported version: %d' % version)
 
 class basepack(versionmixin):
     # The maximum amount we should read via mmap before remmaping so the old