Improve interactive latency

While typing in confetty console in blind test and confetty was using a TLS socket,
the confetty console was noticably chunkier.  The chunkiness could not be detected
on a UNIX socket.  Setting NODELAY on both sides of the socket seems to have eliminated
chunkiness so that at least I can't tell confetty from ssh+ipmitool anymore.

bin/confetty

@@ -296,6 +296,7 @@ def connect_tls_server(serverstring):
         af, socktype, proto, cononname, sa = res
         try:
             server = socket.socket(af, socktype, proto)
+            server.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
         except:
             server = None
             continue

confluent/sockapi.py

@@ -133,6 +133,7 @@ def process_request(connection, request, cfm, authdata):
 def _tlshandler():
     plainsocket = socket.socket()
     plainsocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+    plainsocket.setsockopt(socket.SOL_SOCKET, socket.TCP_NODELAY, 1)
     srv = ssl.wrap_socket(plainsocket, keyfile="/etc/confluent/privkey.pem",
                     certfile="/etc/confluent/srvcert.pem",
                     ssl_version=ssl.PROTOCOL_TLSv1,