asyncio: _fatal_error() of _UnixWritePipeTransport and _ProactorBasePipeTransport shouldn't log BrokenPipeError nor ConnectionResetError.

(Same behaviour as _SelectorTransport._fatal_error().)
diff --git a/Lib/asyncio/unix_events.py b/Lib/asyncio/unix_events.py
index 219c88a..a1aff3f 100644
--- a/Lib/asyncio/unix_events.py
+++ b/Lib/asyncio/unix_events.py
@@ -363,7 +363,8 @@
 
     def _fatal_error(self, exc):
         # should be called by exception handler only
-        logger.exception('Fatal error for %s', self)
+        if not isinstance(exc, (BrokenPipeError, ConnectionResetError)):
+            logger.exception('Fatal error for %s', self)
         self._close(exc)
 
     def _close(self, exc=None):