USHIFT-660: yet another cluster debug info improvement

[pmtk]

changed execution flow to:

• first register commands to run
• print a "table of contents" so it's obvious what command will be executed and easily searched for
• print a command with > prefix and execute the command

By replacing set -x with printing the cmd it is now visually clearer and suitable for inclusion in bug tickets (./validate-microshift/cluster-debug-info.sh > /tmp/cluster.log)

[ggiguash]

/retitle USHIFT-660: yet another cluster debug info improvement

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ggiguash, pmtk

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[openshift-ci]

@pmtk: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-router-smoke-test	6e1bc95	link	false	/test e2e-router-smoke-test

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