py3: use absolute_import in killdaemons.py

tests/killdaemons.py

@@ -1,6 +1,11 b''
 #!/usr/bin/env python
 
-import os, sys, time, errno, signal
+from __future__ import absolute_import
+import errno
+import os
+import signal
+import sys
+import time
 
 if os.name =='nt':
     import ctypes

tests/test-check-py3-compat.t

@@ -41,7 +41,6 b''
   i18n/polib.py not using absolute_import
   setup.py not using absolute_import
   tests/heredoctest.py requires print_function
-  tests/killdaemons.py not using absolute_import
   tests/md5sum.py not using absolute_import
   tests/mockblackbox.py not using absolute_import
   tests/printenv.py not using absolute_import