Update openstack pull-secret to use attachement

[dprince]

Similar to d2e72ba
OpenStack also needs this update.

As the merge_pull_secrets is no longer used it is dropped
as well.

[wking]

c7389d3 looks good to me, although I don't actually understand how all this is wired together. Wish there was a way to rehearse the affected jobs...

[stevekuznetsov]

/lgtm

[stevekuznetsov]

/approve

[droslean]

/lgtm

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprince, droslean, stevekuznetsov

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[hongkailiu]

$ git log  -1 --oneline 
974743e0b (HEAD -> master, origin/master, origin/HEAD) Merge pull request #4823 from dprince/openstack_secrets

$ oc get secret -n ci cluster-secrets-openstack  -o yaml > ~/Downloads/cluster-secrets-openstack.yaml
$ export BW_SESSION="B..."

$ ./ci-operator/populate-secrets-from-bitwarden.sh
...
+ name=cluster-secrets-openstack
+ oc create secret generic cluster-secrets-openstack --from-file=pull-secret=/tmp/tmp.NF1Ko7huba/pull-secret --from-file=clouds.yaml=/tmp/tmp.NF1Ko7huba/clouds.yaml --from-file=insights-live.yaml=/tmp/tmp.NF1Ko7huba/insights-live.yaml --from-file=ssh-privatekey=/tmp/tmp.NF1Ko7huba/ssh-privatekey --from-file=ssh-publickey=/tmp/tmp.NF1Ko7huba/ssh-publickey --dry-run -o yaml
+ oc apply -f -
secret/cluster-secrets-openstack created
+ oc label secret --overwrite cluster-secrets-openstack ci.openshift.io/managed=true
secret/cluster-secrets-openstack labeled

$ bw logout
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