ci-operator/config/.../operator-sdk: update to go 1.11

[AlexNPavel]

Update build_root image used for operator sdk to golang-1.11 to work with go mod PR (operator-framework/operator-sdk#1001)

/cc @estroz

[estroz]

/lgtm

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AlexNPavel, estroz

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[openshift-ci-robot]

@AlexNPavel: Updated the following 2 configmaps:

• ci-operator-master-configs configmap in namespace ci using the following files:
  • key operator-framework-operator-sdk-master.yaml using file ci-operator/config/operator-framework/operator-sdk/operator-framework-operator-sdk-master.yaml
• ci-operator-master-configs configmap in namespace ci-stg using the following files:
  • key operator-framework-operator-sdk-master.yaml using file ci-operator/config/operator-framework/operator-sdk/operator-framework-operator-sdk-master.yaml

In response to this:

Update build_root image used for operator sdk to golang-1.11 to work with go mod PR (operator-framework/operator-sdk#1001)

/cc @estroz

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