SWEEP: Rename BeforeClass/AfterClass to OneTimeSetUp/OneTimeTearDown, #1016

[paulirwin]

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Rename BeforeClass/AfterClass to OneTimeSetUp/OneTimeTearDown to better match NUnit conventions.

Fixes #1016

Description

See #1016 for details and rationale. This is a breaking change because of the changes in TestFramework.

[NightOwl888]

Thanks for the PR.

This looks good. However, I noticed during the review that some of the related documentation comments are incorrect or out of date. Those can either be fixed in this PR or a new issue, but I don't think it is important to update the API docs site for 4.8.0-beta00017 with these changes. In other words, they can be committed to master and we will roll them into the 4.8.0-beta00018 API docs.