Use of ApiMachinery Sets with structs containing references

[shaneutt]

@skriss noticed while we were evaluating #1702 that some of the conformance test code wasn't working for him, particularly #1692 (comment) where the sets functionality from apimachinery was used with a struct with nested references. Sets does not currently support accurate Has(obj) functionality for structs with nested pointers, and so this test can not proceed properly.

Thank you @skriss! 🥳

[shaneutt]

/assign @arkodg

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[shaneutt]

(@arkodg is working on this 👍 )