Don't disable Nagle algorithm in HttpProtocol

0.18.3 evenlet by default disables Nagle algorithm for sockets using
http protocol [1]. It brought a regression to eventlet [2] and this
patch adds workaround that doesn't disable the algorithm.

[1] 40714b1ffa
[2] https://github.com/eventlet/eventlet/issues/301

Change-Id: I79a8583a5fe9812b6609bd4df5623f13c3b81df5
Closes-bug: 1546506

neutron/agent/linux/utils.py

@@ -373,6 +373,12 @@ class UnixDomainHTTPConnection(httplib.HTTPConnection):
 
 
 class UnixDomainHttpProtocol(eventlet.wsgi.HttpProtocol):
+    # TODO(jlibosva): This is just a workaround not to set TCP_NODELAY on
+    # socket due to 40714b1ffadd47b315ca07f9b85009448f0fe63d evenlet change
+    # This should be removed once
+    # https://github.com/eventlet/eventlet/issues/301 is fixed
+    disable_nagle_algorithm = False
+
     def __init__(self, request, client_address, server):
         if client_address == '':
             client_address = ('<local>', 0)