Disable lockutils test_synchronized_externally

We're seeing this test fail very regularly in Jenkins and it's become
a serious distraction for everyone.

Disable the test temporarily and use a bug #1095957 to track that the
test itself needs fixing.

Change-Id: I0645d8f5f740d40f83d82e5ef7a048f33a44ac2b

tests/unit/test_lockutils.py

@@ -27,6 +27,7 @@
 from eventlet import greenpool
 
 from openstack.common import lockutils
+from openstack.common import testutils
 from tests import utils as test_utils
 
 
@@ -128,6 +129,7 @@ def inner_lock():
             if os.path.exists(tempdir):
                 shutil.rmtree(tempdir)
 
+    @testutils.skip_test("Regularly fails, see bug #1095957")
     def test_synchronized_externally(self):
         """We can lock across multiple processes"""
         tempdir = tempfile.mkdtemp()