Don't log OSError exceptions in transports

[Tobotimus]

• uvloop version: 0.12.2
• Python version: 3.7.4
• Platform: Linux (Ubuntu 19.04)
• Can you reproduce the bug with PYTHONASYNCIODEBUG in env?: Yes

This refers to the bpo here: https://bugs.python.org/issue37035

And relevant asyncio changes: python/cpython#13548.

In particular, I am getting this common SSL error in an aiohttp client application of mine:

Fatal error on transport
protocol: <uvloop.loop.SSLProtocol object at 0x7f3a9c52d050>
transport: <TCPTransport closed=False reading=False 0x55d12adcc430>
Traceback (most recent call last):
  File "uvloop/sslproto.pyx", line 574, in uvloop.loop.SSLProtocol._do_shutdown
  File "/home/tobyh/.pyenv/versions/3.7.4/lib/python3.7/ssl.py", line 778, in unwrap
    return self._sslobj.shutdown()
ssl.SSLError: [SSL: KRB5_S_INIT] application data after close notify (_ssl.c:2629)

I'd be willing to PR a fix when I get the time, someone else is welcome to if they beat me to it however 😃