Fix OOM on bastion VM

[kvokka]

In the process of https://www.qwiklabs.com/focuses/5572 got Out Of Memory error from kubectl after any command, which could be managed only with VM restart.

This fix should fix kubectl memory requirement.

[helmsman-bot]

Can one of the admins verify this patch?

[google-oss-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[kvokka]

@googlebot I signed it!

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[kvokka]

/assign @robinpercy