multus: add host checking to validation tool #14230
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In order to help users check that they have implemented the newly-added Multus host configuration prerequisites, add a check to the validation tool to verify connectivity.
Because users who are already running clusters with Multus enabled, add a flag that allows users to only check for host configuration prerequisites. This mode will not start the large number of clients that would normally be started because those clients could disrupt a running Rook cluster negatively.
Manual validation tests:
cleanup
cleans up host checkersChecklist: