Move the sleep command to a separate step

[tosi3k]

As measurements in a single step are run in parallel, sleeping needs to be moved out to a separate step.

/sig scalability
/assign @mborsz
/cc @marseel

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In response to this:

As measurements in a single step are run in parallel, sleeping needs to be moved out to a separate step.

/sig scalability
/assign @mborsz
/cc @marseel

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[wojtek-t]

/lgtm
/approve

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