fix: eventual consistency in vpc tests

[michaelhtm]

Description of changes:
Increasing the update wait time for vpc resource tests. The initial wait
time was determined when ec2 had fewer resources. The more resources
the more we see eventual consistency.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[ack-prow]

@michaelhtm: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ec2-verify-attribution	56a3749	link	false	/test ec2-verify-attribution

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[rushmash91]

thanks @michaelhtm !!
/lgtm

[ack-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: michaelhtm, rushmash91

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[a-hilaly]

Yay, dankeshoen!