Kudo update integration test

[alenkacz]

What type of PR is this?
/component kudoctl

What this PR does / why we need it:
Integration test for kudo update command

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[jbarrick-mesosphere]

One thing I notice in these tests is that we're only checking the updates to the Instance specs, but not checking the statuses or any other expected resources. Would it be a good idea to add some other asserts to make sure the upgrade is actually executed as well? Or do we want to consider this a CLI test and have updates covered somewhere else?

At any rate, what I think we could add:

• Assert on plan execution completion in the instance spec.
• Assert on any of the resources that are created by the operator.

[jbarrick-mesosphere]

/approve

[kudo-ci]

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[kensipe]

as with #681 I would like to suggest that we call the tests update-command instead of kudo-update-command

[jbarrick-mesosphere]

/kind test

[jbarrick-mesosphere]

/lgtm