Added owner-id flag for clusterawsadm ami list

[zeborg]

Signed-off-by: Abhinav Sinha abhinav@nirmata.com

What type of PR is this?
/kind feature

What this PR does / why we need it:
Currently there’s no way to pass a custom owner ID for listing AMIs using clusterawsadm ami list [...] command, but there’s already an implementation for doing the same which is only limited by the lack of a flag to pass a custom owner ID instead of having to use the one owned by Heptio that’s hard-coded within the source at pkg/cloud/services/ec2/ami.go -> DefaultMachineAMIOwnerID.

This PR adds an additional --owner-id flag that can be used to list CAPA AMIs (following the capa-ami-{{.BaseOS}}-{{.K8sVersion}} naming format) on accounts other than the hard-coded one.

cc - @sedefsavas

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

Checklist:

• squashed commits
• includes documentation
• adds unit tests
• adds or updates e2e tests

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @zeborg. Thanks for your PR.

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[sedefsavas]

/ok-to-test

[sedefsavas]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sedefsavas

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