Return the Redis server connection details from the __opts__.

def _get_redis_cache_opts():
    '''
    Return the Redis server connection details from the __opts__.
    '''
    return {
        'host': __opts__.get('cache.redis.host', 'localhost'),
        'port': __opts__.get('cache.redis.port', 6379),
        'unix_socket_path': __opts__.get('cache.redis.unix_socket_path', None),
        'db': __opts__.get('cache.redis.db', '0'),
        'password': __opts__.get('cache.redis.password', ''),
        'cluster_mode': __opts__.get('cache.redis.cluster_mode', False),
        'startup_nodes': __opts__.get('cache.redis.cluster.startup_nodes', {}),
        'skip_full_coverage_check': __opts__.get('cache.redis.cluster.skip_full_coverage_check', False),
    }