fix for backtick escape error

[kkasravi]

Which issue is resolved by this Pull Request:
Resolves #356

Description of your changes:
backticks are escaped as described in the issue.
a second fix is related to returning the earliest 'manifests' in a directory path rather than the latest. If a subdir ends with manifests you will get an error in unit test generation.

Checklist:

• Unit tests have been rebuilt:
  1. cd manifests/tests
  2. make generate
  3. make test

---

This change is 

[kkasravi]

/assign @jlewi
/assign @gabrielwen
/assign @swiftdiaries

[kkasravi]

/assign @hougangliu

[jlewi]

@kkasravi Why use escaping at all? i.e. rather than embed YAML in go files; why not just create YAML files and have the unittests load those files? If this is a quick fix then doing that then I think its fine.

Longer term though it seems like #306 (verifying expected values) is pushing us in the direction of creating a test_data directory that would contain YAML files representing the expected output of kustomize build.

So storing YAML files as opposed to embedding YAML in go files seems more consistent with that.

That said, there's probably a lot more changes needed to realize #306 and I'm not sure that changing the current scripts to emit the kustomize files to YAML rather than embedding in the go code really moves the needle. So I'm fine with the workaround in this PR.

[hougangliu]

please resolve the conflict. lgtm

[kkasravi]

thanks @jlewi - it would be more straight forward to store the files in a different directory and read them in.

[jlewi]

/lgtm
/approve

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