[WIP] add must-gather command

[deads2k]

I don't remember what state I left this in.

@soltysh @sanchezl

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: deads2k

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[openshift-ci-robot]

@deads2k: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
ci/prow/verify	3bc5cd9	link	/test verify

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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