UPSTREAM: 47003: Remove duplicate errors from an aggregate error input.

[aveshagarwal]

@derekwaynecarr

As the upstream PR kubernetes/kubernetes#47003 is merged now, I have updated this PR.

[aveshagarwal]

Do not merge yet as discussions are still going on in upstream kube PR.

[derekwaynecarr]

[merge][severity:blocker]

[smarterclayton]

# github.com/openshift/origin/vendor/k8s.io/apimachinery/pkg/util/errors
vendor/k8s.io/apimachinery/pkg/util/errors/errors_test.go:289: undefined: sort.Slice
vendor/k8s.io/apimachinery/pkg/util/errors/errors_test.go:293: undefined: sort.Slice

[aveshagarwal]

@smarterclayton looking.

[aveshagarwal]

Its happening because golang-1.7 does not understand sort.Slice whereas golang 1.8 does. Would it be ok to remove the unit test part and just have the main code?

[derekwaynecarr]

hmm, can we write go 1.7 style sort? would make any other future backport requests not awful.

[aveshagarwal]

@derekwaynecarr I have updated this PR to make sorting work with go 1.7. I have put same upstream PR number: UPSTREAM: 47003 for these extra changes not in upstream kube.

[derekwaynecarr]

[merge][severity:blocker]

[openshift-bot]

Evaluated for origin merge up to 77a6bb2

[openshift-bot]

[Test]ing while waiting on the merge queue

[openshift-bot]

Evaluated for origin test up to 77a6bb2

[openshift-bot]

continuous-integration/openshift-jenkins/test FAILURE (https://ci.openshift.redhat.com/jenkins/job/test_pull_request_origin/2317/) (Base Commit: 4aa3720) (PR Branch Commit: 77a6bb2)

[openshift-bot]

continuous-integration/openshift-jenkins/merge SUCCESS (https://ci.openshift.redhat.com/jenkins/job/merge_pull_request_origin/1028/) (Base Commit: 8c017d2) (PR Branch Commit: 77a6bb2) (Extended Tests: blocker) (Image: devenv-rhel7_6374)