contrib: make memory.py use absolute_import

contrib/memory.py

@@ -11,6 +11,7 b' Reads current and peak memory usage from'
 prints it to ``stderr`` on exit.
 '''
 
+from __future__ import absolute_import
 import atexit
 
 def memusage(ui):

tests/test-check-py3-compat.t

@@ -5,7 +5,6 b''
   $ hg files 'set:(**.py)' | sed 's|\\|/|g' | xargs python contrib/check-py3-compat.py
   contrib/import-checker.py not using absolute_import
   contrib/import-checker.py requires print_function
-  contrib/memory.py not using absolute_import
   contrib/perf.py not using absolute_import
   contrib/python-hook-examples.py not using absolute_import
   contrib/revsetbenchmarks.py not using absolute_import