Get all fields and values from a redis hash, returns dict

    CLI Example:

    .. code-block:: bash

        salt '*' redis.hgetall foo_hash

def hgetall(key, host=None, port=None, db=None, password=None):
    '''
    Get all fields and values from a redis hash, returns dict

    CLI Example:

    .. code-block:: bash

        salt '*' redis.hgetall foo_hash
    '''
    server = _connect(host, port, db, password)
    return server.hgetall(key)