fix broken links

[ydcool]

Fix several broken links:

• https://github.com/nginxinc/kubernetes-ingress/tree/master/nginx-controller moved to >> https://github.com/nginxinc/kubernetes-ingress/tree/master/cmd/nginx-ingress , see Improve Project Layout and Refactor Controller Package nginxinc/kubernetes-ingress#357

• https://github.com/kubernetes-incubator/kube-aws/blob/master/core/controlplane/config/templates/cluster.yaml moved to >> https://github.com/kubernetes-incubator/kube-aws/blob/master/builtin/files/cluster.yaml.tmpl, see
  refactoring kube-aws / experimental IAM-based kubelet auth #1490

• http://kubernetes.io/docs/admin/multiple-zones/ moved to >> https://kubernetes.io/docs/setup/best-practices/multiple-zones/, see Remove or move topics under docs/admin. kubernetes/website#9140 and Restructure the left navigation pane of setup kubernetes/website#14826

• https://github.com/kubernetes/contrib/tree/master/cluster-autoscaler/cloudprovider/aws moved to >> https://github.com/kubernetes/autoscaler/blob/master/cluster-autoscaler/cloudprovider/aws/ , see Move code that should be maintained to dedicated repos contrib#762

• https://github.com/kubernetes/kubernetes/blob/master/docs/devel/e2e-tests.md moved to >> https://github.com/kubernetes/community/blob/master/contributors/devel/sig-testing/e2e-tests.md, see kubernetes/kubernetes@bc8f7e2#diff-af85f52a6ae0c26db0e563d4706ce926

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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[ydcool]

/assign @dominicgunn

[codecov-io]

Codecov Report

Merging #1781 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1781   +/-   ##
=======================================
  Coverage   24.52%   24.52%           
=======================================
  Files          98       98           
  Lines        5085     5085           
=======================================
  Hits         1247     1247           
  Misses       3699     3699           
  Partials      139      139

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[dominicgunn]

Thank you @ydcool! /lgtm

[dominicgunn]

/lgtm