migrate cname in redis from tsuru 0.6.2 to 0.7.0

migrate_cname.py

import redis, os

HOST = os.getenv("HOST", "localhost")
PORT = os.getenv("PORT", 6379)

r = redis.StrictRedis(host=HOST, port=PORT)
cnames_app = r.keys("cname:*")

for cname_app in cnames_app:
    cname = r.get(cname_app)
    r.delete(cname_app)
    r.lpush(cname_app, cname)
    print "converted %s to list" % cname_app