AWS: resolve subnet-related FIXMEs

[r4f4]

When looking at the subnet code I noticed the comment // FIXME: port to DescribeSubnetsPagesWithContext once we bump our vendored AWS package past v1.19.30. So I did it.

[barbacbd]

/lgtm

[openshift-ci]

@r4f4: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws-single-node	a3544ea	link	false	/test e2e-aws-single-node
ci/prow/e2e-aws-proxy	a3544ea	link	false	/test e2e-aws-proxy

Full PR test history. Your PR dashboard.

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[patrickdillon]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: patrickdillon

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Needs approval from an approver in each of these files:

• pkg/asset/installconfig/aws/OWNERS [patrickdillon]
• pkg/destroy/aws/OWNERS [patrickdillon]

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[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD 36e5ac3 and 2 for PR HEAD a3544ea in total

[r4f4]

/retest-required

[r4f4]

/skip