Maintenance mode for DPF CI clusters

[josecastillolema]

Sometimes when troubleshooting a failed DPF deployment on the CI lab we do not want to be interrupted for a new deployment triggered through CI.
This PR allows to put the cluster in "maintenance mode" by creating a /root/pause file and thus to make sure if a job is triggered from CI it won't be able to redeploy the cluster and interrupt the troubleshooting session.

Housekeeping:

• Remove trailing whitespaces
• Standardize on 2-space indentation for bash code

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: josecastillolema
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[openshift-merge-bot]

[REHEARSALNOTIFIER]
@josecastillolema: the pj-rehearse plugin accommodates running rehearsal tests for the changes in this PR. Expand 'Interacting with pj-rehearse' for usage details. The following rehearsable tests have been affected by this change:

Test name	Repo	Type	Reason
pull-ci-rh-ecosystem-edge-openshift-dpf-main-deploy-cluster	rh-ecosystem-edge/openshift-dpf	presubmit	Registry content changed

Prior to this PR being merged, you will need to either run and acknowledge or opt to skip these rehearsals.

Interacting with pj-rehearse

Comment: /pj-rehearse to run up to 5 rehearsals
Comment: /pj-rehearse skip to opt-out of rehearsals
Comment: /pj-rehearse {test-name}, with each test separated by a space, to run one or more specific rehearsals
Comment: /pj-rehearse more to run up to 10 rehearsals
Comment: /pj-rehearse max to run up to 25 rehearsals
Comment: /pj-rehearse auto-ack to run up to 5 rehearsals, and add the rehearsals-ack label on success
Comment: /pj-rehearse list to get an up-to-date list of affected jobs
Comment: /pj-rehearse abort to abort all active rehearsals
Comment: /pj-rehearse network-access-allowed to allow rehearsals of tests that have the restrict_network_access field set to false. This must be executed by an openshift org member who is not the PR author

Once you are satisfied with the results of the rehearsals, comment: /pj-rehearse ack to unblock merge. When the rehearsals-ack label is present on your PR, merge will no longer be blocked by rehearsals.
If you would like the rehearsals-ack label removed, comment: /pj-rehearse reject to re-block merging.

[openshift-ci]

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