revert TCP__FASTOPEN change

on OSX socket.TCP_FASTOPEN is set but make the server enter in a loop while
trying to set the options which makes gunicorn unusable.

For now remove TCP_FASTOPEN option until we find a solution

gunicorn/config.py

@@ -1705,37 +1705,3 @@ if sys.version_info >= (2, 7):
         desc = """\
         Ciphers to use (see stdlib ssl module's)
         """
-
-
-class AllowTCPFastOpen(Setting):
-    name = "allow_tcp_fast_open"
-    section = "Server Socket"
-    cli = ["--allow-tcp-fast-open"]
-    validator = validate_bool
-    default = False
-    action = "store_true"
-    desc = """\
-    Whether the server will allow the TCP Fast Open.
-
-    Available on Linux >= 3.7.1, Python>=  3.4
-
-    More info: http://research.google.com/pubs/pub37517.html
-
-    .. versionadded:: 19.5
-    """
-
-
-class TCPFastOpenQueue(Setting):
-    name = "tcp_fast_open_queue"
-    section = "Server Socket"
-    cli = ["--tcp-fast-open-queue"]
-    meta = "INT"
-    validator = validate_pos_int
-    type = int
-    default = 5
-    desc = """\
-    The size of the TCP Fast Open queue. If the number of connections exceed
-    this value, the other connections are proceed with a normal 3-way.
-
-    .. versionadded:: 19.5
-    """

gunicorn/sock.py

@@ -75,11 +75,6 @@ class TCPSocket(BaseSocket):
 
     def set_options(self, sock, bound=False):
         sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
-
-        if hasattr(socket, 'TCP_FASTOPEN') and self.cfg.allow_tcp_fast_open:
-            sock.setsockopt(socket.SOL_TCP, socket.TCP_FASTOPEN,
-                    self.cfg.tcp_fast_open_queue)
-
         return super(TCPSocket, self).set_options(sock, bound=bound)