Improve Python 3.x compatibility

Mechanical translation of deprecated constructs
to 3.x compatible variants.

Change-Id: I4988d0ac656903e0d0320aaa8361d4eeb774a0f9

openstack/common/lockutils.py

@@ -82,7 +82,7 @@ class _InterProcessLock(object):
                 # to have a laughable 10 attempts "blocking" mechanism.
                 self.trylock()
                 return self
-            except IOError, e:
+            except IOError as e:
                 if e.errno in (errno.EACCES, errno.EAGAIN):
                     # external locks synchronise things like iptables
                     # updates - give it some time to prevent busy spinning

tests/unit/test_processutils.py

@@ -72,7 +72,7 @@ class ProcessExecutionErrorTest(utils.BaseTestCase):
         the Wielder of Wonder, with world's renown.
         """.strip()
         err = processutils.ProcessExecutionError(stdout=stdout)
-        print err.message
+        print(err.message)
         self.assertTrue('people-kings' in err.message)
 
     def test_with_stderr(self):