uasyncio: Cleanup module imports after split up.

uasyncio/uasyncio/__init__.py

@@ -1,15 +1,9 @@
-import time
-import heapq
 import errno
-import logging
+import select
+import usocket as _socket
 from uasyncio.core import *
 
 
-log = logging.getLogger("asyncio")
-
-
-import select
-
 class EpollEventLoop(EventLoop):
 
     def __init__(self):
@@ -48,8 +42,6 @@ def get_event_loop():
     return EpollEventLoop()
 
 
-import usocket as _socket
-
 class StreamReader:
 
     def __init__(self, s):

uasyncio/uasyncio/core.py

@@ -1,7 +1,5 @@
-import __main__
 import time
 import heapq
-import errno
 import logging