windows: make sure we fully read and cleanly close the connection

Maybe this will prevent server on Windows to sometimes complains about the
client closing the connection too soon. So we make sure we read everything and
we officially close the connection.

Hopefully Windows will be happier and the test will stop being flaky.

Differential Revision: https://phab.mercurial-scm.org/D11073

tests/get-with-headers.py

@@ -84,7 +84,11 b' def request(host, path, show):'
                 b"%s: %s\n"
                 % (h.encode('ascii'), response.getheader(h).encode('ascii'))
             )
-    if not headeronly:
+    if headeronly:
+        # still read the body to prevent windows to be unhappy about that
+        # (this might some flakyness in test-hgweb-filelog.t on Windows)
+        data = response.read()
+    else:
         stdout.write(b'\n')
         data = response.read()
 
@@ -112,6 +116,9 b' def request(host, path, show):'
     if twice and response.getheader('ETag', None):
         tag = response.getheader('ETag')
 
+    # further try to please the windows-flakyness deity
+    conn.close()
+
     return response.status