rehearse: use updateconfig to generate CMs

[bbguimaraes]

I am still working on templates, as that will require more fundamental changes, but the basic mechanism is already reviewable.

[stevekuznetsov]

@bbguimaraes you want to make sure this is ready to go for the profiles and then do templates in another PR?

[bbguimaraes]

I am considering it. The template changes are almost done, they would make the PR significantly larger and are mostly orthogonal.

It would be nice to get #122 in before this so I can add proper integration tests, I'll take a look and see what's left in there.

[petr-muller]

LGTM, nice! Would prefer to merge this and have another PR for templates...

[bbguimaraes]

Rebased and updated. If you've reviewed this before, I tried to keep the diff to a minimum: check only the last commit. I'll squash when approved. This can be merged as is, but you can also check the template PR:

#146

Main differences from the previous version:

• fixed path in main.go (caught by rehearse: add integration test for profiles #140)
• fixed to create only necessary profiles (caught by rehearse: last round of small refactorings #143)
• added necessary files for the new integration tests in rehearse: add integration test for profiles #140
• added an update reactor to the dry-run client, the create reactor is kept because of the old template code and is removed in the next PR

[bbguimaraes]

Incorporated @petr-muller's suggestion and added an extra test fix that got lost during the refactorings.

[bbguimaraes]

Rebase and squashed.

Some small changes were necessary because of an upstream change to the interface of the updateconfig functions: kubernetes/test-infra@8ca3546.

[stevekuznetsov]

/lgtm
/approve

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