whinlatter support

[aduskett]

This pull request is for reference and isn't meant to be merged as meta-mender upstream only supports LTS releases.

However, if anyone is looking to integrate mender into Whinlatter, they may use this fork!

[mender-test-bot]

@aduskett, start a full client pipeline with:

• mentioning me and start client pipeline

---

my commands and options

You can prevent me from automatically starting CI pipelines:

• if your pull request title starts with "[NoCI] ..."

You can trigger a client pipeline on multiple prs with:

• mentioning me and start client pipeline --pr mender/127 --pr mender-connect/255

You can trigger GitHub->GitLab branch sync with:

• mentioning me and sync

You can cherry pick to a given branch or branches with:

• mentioning me and:

 cherry-pick to:
 * 1.0.x
 * 2.0.x