Add unit test to verify pre-shared cert retention #111
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There was a bug when transitioning from a pre-shared certificate to a secret-based certificate. The controller deletes the pre-shared certificate when it really should ignore it (quote kubernetes/ingress-nginx#639). This PR adds an unit test for that.
Ref https://docs.google.com/document/d/1E2ufxZGujFCYKYOsvBjb4VMNjBy8CM-MMycoT_UVwIs/edit#heading=h.djafujeypqcp.
/assign @nicksardo @rramkumar1