Dockerfile.*: bump to go1.11

[runcom]

Signed-off-by: Antonio Murdaca [email protected]

- What I did

Switched go version in images from 1.10 to 1.11 (openshift/release#3394)
This allows us to finally have #600 to be consistent with gofmt and can go in

- How to verify it

CI

- Description for the changelog

[runcom]

The openshift/release PR is here openshift/release#3413

[LorbusChris]

/lgtm

[runcom]

/retest

[runcom]

/hold
/lgtm cancel

(this is at risk for 4.1 and openshift/release PR to be reverted but let's hold for now)

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: LorbusChris

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[runcom]

This is gonna be 4.2

[openshift-ci-robot]

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

Test name	Commit	Details	Rerun command
ci/prow/e2e-aws-upgrade	11443ce	link	/test e2e-aws-upgrade
ci/prow/e2e-aws-op	11443ce	link	/test e2e-aws-op
ci/prow/e2e-aws	11443ce	link	/test e2e-aws

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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