Implement load_replace_candidate()

[kace]

This method isn't supported according to the readme, but in practice the function call seems to work if we define a dest_file. It's a one line change other than adding tests (not sure if tests are done for anything besides getters?).

Same thing as for #39 I'm trying to push my local fixes upstream.

[housepbass]

I would be very happy to have this functionality. Any status updates on progress?

[kace]

Ah. I've totally forgotten about this. I'll see if I can make time this weekend for it.

[housepbass]

Hey Kace, have you had a chance to work on this? I’m about to do a huge OS10 rollout and this would be supremely helpful.

[housepbass]

What's the one-line change that implements this function? Also, it looks like the operation isn't defined. I have a suspicion this may not be possible as dellos10 doesn't have 'replace candidate' functionality. Is that correct?

    if self.config_replace:
        # Replace operation
        raise NotImplementedError("Configuration not supported")
    else: