Fix unseal-period CLI option

[sheldonkwok]

Right now you can configure the `unseal-period` but it's not being used. This utilizes it in the sleep. 

[sheldonkwok]

/assign @munnerz

[sheldonkwok]

@simonswine any chance someone else can take a look? It's just a one line fix on a CLI option. Thanks!
cc @munnerz

[simonswine]

/unassign @munnerz
/assign
/ok-to-test

[simonswine]

/assign @sheldonkwok
/unassign

Thanks for your contribution, thanks for fixing this oversight.
Can you add the DCO sign off to your commit please (yay legals)

And reassign to me once that is done

[sheldonkwok]

Done, thanks!
/assign @simonswine

[sheldonkwok]

@simonswine any update on this?

[fladrif]

This would be helpful for me as well, what's the status on this PR?

[JoshVanL]

/lgtm

[JoshVanL]

@simonswine assume ok to approve?

[munnerz]

/approve

[jetstack-bot]

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