Upgrade Python 2 code (#181)

Author: cclauss

contrib/release/bump_version.py

@@ -23,7 +23,7 @@ def cmd(*args):
 def no_enoent():
     try:
         yield
-    except OSError, exc:
+    except OSError as exc:
         if exc.errno != errno.ENOENT:
             raise
 

funtests/disabled_basic_get_leak.py

@@ -10,12 +10,12 @@
 
 from time import sleep
 
-for i in xrange(10000):
+for i in range(10000):
     c.basic_publish('foo', exchange='getmem', routing_key='getmem')
     if not i % 1000:
         print('sent %s' % i)
 
-for i in xrange(10000):
+for i in range(10000):
     assert c.basic_get('getmem', no_ack=True)
     if not i % 1000:
         print(i)