Automatic merge from submit-queue (batch tested with PRs 62503, 62502). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Fix ingress util for setting TLS spec

**What this PR does / why we need it**:
Fixes an issue with ingress TLS testing.  For most tests, we want to only provide one certificate and verify it's being served. In some tests (including a conformance test), a new certificate was added; but only the first certificate was asserted. 

This is because the multi-TLS test uses `WaitForIngressWithCert()` while the other tests use `WaitForGivenIngressWithTimeout`.

**Special notes for your reviewer**:
/assign rramkumar1
/cc rramkumar1

**Release note**:
```release-note
NONE
```