[Do Not Merge] Compatibility updates for the latest swift-corelibs-xctest #261
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Since apple/swift-corelibs-xctest#40 was merged which contained breaking changes, we need to make some adjustments to remain compatible. This shouldn't be merged until the next Swift development snapshot is posted, though!
Also note that the XCTestCase subclasses here needing to be final is due to our XCTestCaseProvider protocol (no longer present in swift-corelibs-xctest!) which allows us to fail tests on OS X which are missing from allTests. This will be obsolete once SwiftPM gains support for codegen-ing allTests which is well on the way.