Opening up the disable snapshot interfaces list

[john-science]

Description

There was a hard-coded list in snapshots.py that recently became really important. People might need to change this list. By preference, I believe this is not so common a need that it should be done as a Setting; it would be better as a class attribute. Even without this request, this list is better as a class attribute, because we don't like hard-coding data.

NOTE: Based on a discussion yesterday with @keckler, I am finally removing our rule against using the super() method. I have not found this rule to be productive or helpful. It's high past time.

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Checklist

• This PR has only one purpose or idea.
• Tests have been added/updated to verify that the new/changed code works.

• The code style follows good practices.
• The commit message(s) follow good practices.

• The release notes (location doc/release/0.X.rst) are up-to-date with any bug fixes or new features.
• The documentation is still up-to-date in the doc folder.
• The dependencies are still up-to-date in setup.py.