Support for SSL when connecting to Redis

[hcvdwerf]

I want to connect with Redis via SSL. It looks like the code doesn't support it:

ckanext-harvest/ckanext/harvest/queue.py

Line 217 in 8ea4b1b

class RedisPublisher(object):

For example:
ssl_connection = redis.Redis(host='localhost', port=6666, ssl=True, ssl_cert_reqs="none")