set TCP_NODELAY to true to fix PYCBC-32

Also switched to socket.create_connection() for better
IP4/IP6 address handling.

Change-Id: I153d7e838132c7cb105ca8e77c41ce867a69d829
Reviewed-on: http://review.couchbase.org/20263
Reviewed-by: Pavel Paulau <pavel.paulau@gmail.com>
Tested-by: Benjamin Young <benjamin@couchbase.com>

couchbase/memcachedclient.py

@@ -40,8 +40,8 @@ def __init__(self, host='127.0.0.1', port=11210):
         """Memcached Binary Protocol Client"""
         self.host = host
         self.port = port
-        self.s = socket.socket()
-        self.s.connect_ex((host, port))
+        self.s.create_connection((host, port))
+        self.s.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
         self.r = random.Random()
         self.log = logger("MemcachedClient")
         self.vbucket_count = 1024