feat(yamllint): include for this repo and apply rules throughout
* Semi-automated using `ssf-formula` (v0.5.0)
* Fix errors shown below:
```bash
chrony-formula$ $(grep "\- yamllint" .travis.yml | sed -e "s:^\s\+-\s\(.*\):\1:")
pillar.example
1:1 warning missing document start "---" (document-start)
21:3 warning comment not indented like content (comments-indentation)
```
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