Fixes #4036: Move r30087 to v1.7 branch (Update component-level selection comments to)

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r30087 [[BR]]
Update component-level selection comments to match latest revisions

cmr=v1.7.4:reviewer=rhc
Fixes #4034: Move r30081 to v1.7 branch (Ensure the ipv6 lists get)

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r30081 [[BR]]
Ensure the ipv6 lists get initialized and finalized

cmr=v1.7.4:reviewer=jsquyres