Merge pull request #60591 from MrHohn/fix-probableEOF-panic

Automatic merge from submit-queue (batch tested with PRs 52077, 60456, 60591). 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>.

[e2e] Fix panicing ingress jobs

**What this PR does / why we need it**:
When a nil error is passed into IsProbableEOF(), test will panic. Ref https://github.com/kubernetes/kubernetes/issues/60381#issuecomment-369353511.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #60381

**Special notes for your reviewer**:
/assign @shyamjvs 
cc @krzyzacy 

**Release note**:

```release-note
NONE
```
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@ -61,6 +61,9 @@ func JoinPreservingTrailingSlash(elem ...string) string {
// differentiate probable errors in connection behavior between normal "this is
// disconnected" should use the method.
func IsProbableEOF(err error) bool {
if err == nil {
return false
}
if uerr, ok := err.(*url.Error); ok {
err = uerr.Err
}