remove use of u* modules

Author: dhalbert

asyncio/event.py

@@ -69,7 +69,7 @@ async def wait(self):
 # that asyncio will poll until a flag is set.
 # Note: Unlike Event, this is self-clearing.
 try:
-    import uio
+    import io
 
     class ThreadSafeFlag(uio.IOBase):
         def __init__(self):

asyncio/stream.py

@@ -150,7 +150,7 @@ async def open_connection(host, port):
     """
 
     from uerrno import EINPROGRESS
-    import usocket as socket
+    import socket
 
     ai = socket.getaddrinfo(host, port, 0, socket.SOCK_STREAM)[0]  # TODO this is blocking!
     s = socket.socket(ai[0], ai[1], ai[2])
@@ -222,7 +222,7 @@ async def start_server(cb, host, port, backlog=5):
     This is a coroutine.
     """
 
-    import usocket as socket
+    import socket
 
     # Create and bind server socket.
     host = socket.getaddrinfo(host, port)[0]  # TODO this is blocking!