Use only integer part of mtime in workingfilectx.date(), fixes test-context.py

Similar to what is done in dirstate.status() (changeset 882e703eaa94)
and has to be removed when Mercurial switches to subsecond granularity.

mercurial/context.py

@@ -510,7 +510,7 b' class workingfilectx(filectx):'
     def date(self):
         t, tz = self._changectx.date()
         try:
-            return (os.lstat(self._repo.wjoin(self._path)).st_mtime, tz)
+            return (int(os.lstat(self._repo.wjoin(self._path)).st_mtime), tz)
         except OSError, err:
             if err.errno != errno.ENOENT: raise
             return (t, tz)