[PATCH v3 01/13] python/aqmp: Fix wait_closed work-around for python 3.6

[G S Niteesh Babu <niteesh.gs@gmail.com>]

Before this patch the wait_closed work-around for python 3.6
fails during disconnect.
This is a temproray work around for which might be fixed in the
future or will be completely removed when the minimum python
version is raised to 3.7.

This patch was originally written by John Snow <jsnow@redhat.com>

Signed-off-by: G S Niteesh Babu <niteesh.gs@gmail.com>
---
 python/qemu/aqmp/util.py | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/python/qemu/aqmp/util.py b/python/qemu/aqmp/util.py
index de0df44cbd..eaa5fc7d5f 100644
--- a/python/qemu/aqmp/util.py
+++ b/python/qemu/aqmp/util.py
@@ -134,7 +134,17 @@ def is_closing(writer: asyncio.StreamWriter) -> bool:
 
     while not transport.is_closing():
         await asyncio.sleep(0)
-    await flush(writer)
+
+    # This is an ugly workaround, but it's the best I can come up with.
+    sock = transport.get_extra_info('socket')
+
+    if sock is None:
+        # Our transport doesn't have a socket? ...
+        # Nothing we can reasonably do.
+        return
+
+    while sock.fileno() != -1:
+        await asyncio.sleep(0)
 
 
 def asyncio_run(coro: Coroutine[Any, Any, T], *, debug: bool = False) -> T:
-- 
2.17.1