Fix logging

slapos/recipe/build/tests.py

 import doctest
 from zope.testing import renormalizing
 
+import logging
 import os
 import re
 import shutil
@@ -9,7 +10,6 @@ import subprocess
 import tempfile
 import unittest
 import zc.buildout.testing
-from logging import log
 from subprocess import check_call, check_output
 from slapos.recipe.gitclone import GIT_CLONE_ERROR_MESSAGE, \
     GIT_CLONE_CACHE_ERROR_MESSAGE
@@ -89,7 +89,7 @@ class GitCloneNonInformativeTests(unittest.TestCase):
         subprocess.check_call('git add .', cwd=proj_dir, shell=True)
     except subprocess.CalledProcessError as e:
         # XXX: This is ugly and old. Change it before review
-        log.error("'git add .' failed with '{}'".format(e.returncode))
+        logging.error("'git add .' failed with '{}'".format(e.returncode))
 
   def git_commit(self, proj_dir, msg):
     """runs a 'git commit -m msg' in the provided git repo
@@ -98,7 +98,7 @@ class GitCloneNonInformativeTests(unittest.TestCase):
     try:
         subprocess.check_call('git commit -m "{}"'.format(msg), cwd=proj_dir, shell=True)
     except subprocess.CalledProcessError as e:
-        log.error("'git commit' failed with '{}'".format(e.returncode))
+        logging.error("'git commit' failed with '{}'".format(e.returncode))
 
   def get_repo_head_commit(self, proj_dir, branch='master'):
     """
@@ -109,7 +109,7 @@ class GitCloneNonInformativeTests(unittest.TestCase):
                                           cwd=proj_dir, shell=True).decode("utf-8")
         return output.rstrip()
     except subprocess.CalledProcessError :
-        log.error("failed to call 'git rev-parse'")
+        logging.error("failed to call 'git rev-parse'")
         return None
 
   def makeGitCloneRecipe(self, options):