add step to use the proxy

[camilamacedo86]

Description of the change:

• Add a step to use the proxy
• Upgrade kube version

Motivation for the change:

Related to #2103

[camilamacedo86]

@joelanford besides your comment that the GOPROXY is used by default in the 1.3 would not better we keep it here just in case?

[openshift-ci-robot]

@camilamacedo86: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
ci/prow/e2e-aws-helm	2154144	link	/test e2e-aws-helm
ci/prow/e2e-aws-ansible	2154144	link	/test e2e-aws-ansible

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[joelanford]

@camilamacedo86 I don't think we should include the GOPROXY change, since it theoretically should have no impact on dependency resolution.

Also, I agree we might need to change the kubernetes version compatibility info, but we probably need more discussion on that since newer versions of kubernetes have backwards compatibility guarantees. Maybe close this PR and raise this as a question in #2083?