remove unused lines that break python 3.x

Author: schwehr

async/pool.py

@@ -31,7 +31,6 @@
 import sys
 import weakref
 from time import sleep
-import new
 
 
 __all__ = ('PoolReader', 'Pool', 'ThreadPool')

async/task.py

@@ -6,11 +6,9 @@
 from util import ReadOnly
 from channel import IteratorReader
 
-
 import threading
 import weakref
 import sys
-import new
 
 __all__ = ('Task', 'ThreadTaskBase', 'IteratorTaskBase', 
             'IteratorThreadTask', 'ChannelThreadTask')

async/util.py

@@ -7,7 +7,6 @@
 from threading import (
     Lock,
     _allocate_lock,
-    _Condition, 
     _sleep,
     _time,
     )