py3: use absolute_import in revlog-formatv0.py

tests/revlog-formatv0.py

@@ -17,7 +17,9 description:
 empty file
 """
 
-import os, sys
+from __future__ import absolute_import
+import os
+import sys
 
 files = [
     ('formatv0/.hg/00changelog.i',

tests/test-check-py3-compat.t

@@ -44,7 +44,6
   tests/md5sum.py not using absolute_import
   tests/readlink.py not using absolute_import
   tests/readlink.py requires print_function
-  tests/revlog-formatv0.py not using absolute_import
   tests/run-tests.py not using absolute_import
   tests/sitecustomize.py not using absolute_import
   tests/svn-safe-append.py not using absolute_import