unified name of utils module, recently it was named util and utils in different packages

Author: Byron

Diff for: lib/git/objects/tag.py

@@ -8,7 +8,7 @@
 """
 import base
 import commit
-from util import get_object_type_by_name
+from utils import get_object_type_by_name
 
 class TagObject(base.Object):
 	"""

Diff for: lib/git/objects/util.py renamed to lib/git/objects/utils.py

@@ -7,7 +7,7 @@
 Module containing all ref based objects
 """
 from objects.base import Object
-from objects.util import get_object_type_by_name
+from objects.utils import get_object_type_by_name
 from utils import LazyMixin
 
 class Ref(LazyMixin):

Diff for: lib/git/refs.py

@@ -10,7 +10,7 @@
 import git.objects.base as base
 import git.refs as refs
 from itertools import chain
-from git.objects.util import get_object_type_by_name
+from git.objects.utils import get_object_type_by_name
 
 class TestBase(object):