py3: use absolute_import in test-parseindex2.py

tests/test-check-py3-compat.t

@@ -60,7 +60,6 b''
   tests/test-lrucachedict.py not using absolute_import
   tests/test-lrucachedict.py requires print_function
   tests/test-manifest.py not using absolute_import
-  tests/test-parseindex2.py not using absolute_import
   tests/test-parseindex2.py requires print_function
   tests/test-pathencode.py not using absolute_import
   tests/test-pathencode.py requires print_function

tests/test-parseindex2.py

@@ -3,8 +3,14 b''
 It also checks certain aspects of the parsers module as a whole.
 """
 
-from mercurial import parsers
-from mercurial.node import nullid, nullrev
+from __future__ import absolute_import
+from mercurial import (
+    parsers,
+)
+from mercurial.node import (
+    nullid,
+    nullrev,
+)
 import struct
 import subprocess
 import sys