etcd operator: add lint pre and postsubmit jobs

[ivanvc]

Part of etcd-io/etcd-operator#21.

/cc @jmhbnz

[ivanvc]

Ping @jmhbnz. Could you PTAL at this? Thanks :)

[jmhbnz]

Thanks @ivanvc

/lgtm
/approve

[k8s-ci-robot]

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[k8s-ci-robot]

@ivanvc: Updated the job-config configmap in namespace default at cluster test-infra-trusted using the following files:

• key etcd-operator-postsubmits.yaml using file config/jobs/etcd/etcd-operator-postsubmits.yaml
• key etcd-operator-presubmits.yaml using file config/jobs/etcd/etcd-operator-presubmits.yaml

In response to this:

Part of etcd-io/etcd-operator#21.

/cc @jmhbnz

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