Allow SnapAdmin's extract_data to accept a dict

[lamoni]

Description of Issue/Question

This is an issue I'm opening to remind myself to add this functionality. Using JSnapy as a module is very cumbersome when it comes to dynamically snapshotting/checking a device (your options are either pass a YAML string formatted the same as a config file, which sticks out like a wart in code and suffers from a bunch of weird issues like needing to hard cast the multi-line string from a bytestring to an actual str since extract_data does an isinstance check to see if it's of type str... or write to a .yml file and then pass that as the argument to snap). It'd be much better if we could just pass a dict.

Setup

Code in question

    if os.path.isfile(config_data):
        data = open(config_data, 'r')
        config_data = yaml.load(data)
    elif isinstance(config_data, str):
        config_data = yaml.load(config_data)
    else:
        self.logger.info(
            colorama.Fore.RED +
            "Incorrect config file or data, please chk !!!!", extra=self.log_detail)
        exit(1)