Allow optional list of YAML objects as param to create_from_yaml util

[mecampbellsoup]

Description

Currently we are doing something like the following to use the utils.create_from_yaml helper:

manifest_path = os.path.join('/tmp', name)
with open(template_path, 'r') as t, open(manifest_path, 'w') as outfile:
    template = Template(t.read())
    output = template.render(ns_name=ns_name)
    outfile.write(output)
await utils.create_from_yaml(k8s_client=api, yaml_file=manifest_path)

We have a YAML template file which we dynamically inject variables into, which is finally passed to the util function.

There is an extra read happening here that could/should be removed. Adding an optional param yaml_objects seemed like a safe, backwards-compatible approach.

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[mecampbellsoup]

/assign @roycaihw

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/lifecycle stale

[mecampbellsoup]

@yliaog @roycaihw should I rebase this, are you guys interesting in merging it?

[roycaihw]

/remove-lifecycle stale

Sorry for the late response. The change looks good to me. Please rebase and I will tag the PR

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mecampbellsoup, roycaihw

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[mecampbellsoup]

@roycaihw rebased & fixed conflicts!

[roycaihw]

/lgtm