Rename module from "github.com/k14s/ytt" to "github.com/vmware-tanzu/carvel-ytt"

[pivotaljohn]

Describe the problem/challenge you have

We've now received multiple external requests to align the module name with the repo name, including:

• invalid module name in go.mod #583

Describe the solution you'd like
Rename the module and all references to it.

Anything else you would like to add:
This is part of vmware-tanzu/carvel#153

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To Do:

• Perform the rename
• Give the Carvel repos a review (example: vmware-tanzu/carvel) to see if any repos are consuming ytt so that they can be updated.
• broadcast this change in slack channels so that any consumers are aware.

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[pivotaljohn]

important-soon: we've had more than one request for this. Placed in the backlog to be strategically occurring when little (no?) other work would be in flight (to minimize the potential for merge conflicts).

[aaronshurley]

Let's make sure we broadcast this change in slack channels so that any consumers are aware.

Give the Carvel repos a review (example: vmware-tanzu/carvel) to see if any repos are consuming ytt so that they can be updated.

[gcheadle-vmware]

Repos consuming ytt:

• kapp:
  • code and go.mod
• vendir:
  • examples
• Carvel:
  • examples
• ytt.vim
  • readme
• vscode-ytt
  • readme
• lib-4-k8s
  • example
• lib-4-k8s-demo
  • readme
• kbld:
  • N/A
• imgpkg:
  • N/A
• kapp controller:
  • N/A

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directory examples/integrating-with-ytt/internal-templating/ imports ytt v0.38.0 with module: github.com/k14s/ytt v0.38.0. Since v0.40.0 will be the first release with the new module name, this dependency will not need to be updated.

[gcheadle-vmware]

Previous slack message from Joao: https://vmware.slack.com/archives/CUK1X0Z8Q/p1643296774183100?thread_ts=1643253820.181400&cid=CUK1X0Z8Q

Slack message to go along with version ytt v0.40.0 release:

Hello ytt users 👋

As of the release of ytt v0.40.0, the go module has been renamed from github.com/k14s/ytt to github.com/vmware-tanzu/carvel-ytt so that it matches the repository name where it is stored. Since this might cause disruption in your workflow, v0.40.0 only contains the rename module change and has no feture difference with v0.39.0.

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slack message for klt-private kapp team:
@ kapp With the upcoming release of ytt v0.40.0, the go module name has changed to github.com/vmware-tanzu/carvel-ytt . Currently kapp is using ytt v0.36.0 in its go.mod so this change should not impact you until you decide to update to v0.40.0.

[gcheadle-vmware]

Completed in ytt v0.40.0