Avoid concurrent writes to a map in dynamicWatch

[tomasaschan]

Fixes #193

CC @justinsb

[k8s-ci-robot]

Hi @tomasaschan. Thanks for your PR.

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[justinsb]

Thanks @tomasaschan

/ok-to-test
/approve
/lgtm

[tomasaschan]

Ah, I'm not allowed to close issues with the comment? Let me rephrase then...

[tomasaschan]

@justinsb I think this needs another /lgtm, since I had to remove something from the commit message.

[justinsb]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: justinsb, tomasaschan

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