Use 'except ... as' syntax

This syntax works on Python 2.6 through 3.x.  lib/ansible/module_utils
(and lib/ansible/modules) need to support Python 2.4, so I didn't touch
those.

lib/ansible/executor/process/worker.py

@@ -67,7 +67,7 @@ class WorkerProcess(multiprocessing.Process):
             if fileno is not None:
                 try:
                     self._new_stdin = os.fdopen(os.dup(fileno))
-                except OSError, e:
+                except OSError as e:
                     # couldn't dupe stdin, most likely because it's
                     # not a valid file descriptor, so we just rely on
                     # using the one that was passed in
@@ -137,7 +137,7 @@ class WorkerProcess(multiprocessing.Process):
                 except:
                     # FIXME: most likely an abort, catch those kinds of errors specifically
                     break
-            except Exception, e:
+            except Exception as e:
                 debug("WORKER EXCEPTION: %s" % e)
                 debug("WORKER EXCEPTION: %s" % traceback.format_exc())
                 try: