feat(yamllint): include for this repo and apply rules throughout

* Semi-automated using `ssf-formula` (v0.5.0)
* Fix errors shown below:

```bash
influxdb-formula$ $(grep "\- yamllint" .travis.yml | sed -e "s:^\s\+-\s\(.*\):\1:")
./influxdb/config_defaults.yaml
  1:1       warning  missing document start "---"  (document-start)

./influxdb/defaults.yaml
  1:1       warning  missing document start "---"  (document-start)
  17:24     warning  truthy value should be one of [false, true]  (truthy)

pillar.example
  1:1       warning  missing document start "---"  (document-start)
  4:24      warning  truthy value should be one of [false, true]  (truthy)

test/salt/default/pillar/influxdb.sls
  5:24      warning  truthy value should be one of [false, true]  (truthy)
```

.travis.yml

@@ -3,7 +3,7 @@
 ---
 stages:
   - test
-  - commitlint
+  - lint
   - name: release
     if: branch = master AND type != pull_request
 
@@ -45,16 +45,21 @@ script:
 
 jobs:
   include:
-    # Define the commitlint stage
-    - stage: commitlint
+    # Define the `lint` stage (runs `yamllint` and `commitlint`)
+    - stage: lint
       language: node_js
       node_js: lts/*
       before_install: skip
       script:
+        # Install and run `yamllint`
+        - pip install --user yamllint
+        # yamllint disable-line rule:line-length
+        - yamllint -s . .yamllint pillar.example test/salt/pillar/influxdb.sls
+        # Install and run `commitlint`
         - npm install @commitlint/config-conventional -D
         - npm install @commitlint/travis-cli -D
         - commitlint-travis
-    # Define the release stage that runs semantic-release
+    # Define the release stage that runs `semantic-release`
     - stage: release
       language: node_js
       node_js: lts/*

.yamllint

@@ -0,0 +1,16 @@
+# -*- coding: utf-8 -*-
+# vim: ft=yaml
+---
+# Extend the `default` configuration provided by `yamllint`
+extends: default
+
+# Files to ignore completely
+# 1. All YAML files under directory `node_modules/`, introduced during the Travis run
+ignore: |
+  node_modules/
+
+rules:
+  line-length:
+    # Increase from default of `80`
+    # Based on https://github.com/PyCQA/flake8-bugbear#opinionated-warnings (`B950`)
+    max: 88

docs/README.rst

@@ -14,7 +14,7 @@ influxdb-formula
    :scale: 100%
    :target: https://github.com/semantic-release/semantic-release
 
-Formula to set up and configure influxdb
+Formula to set up and configure influxdb.
 
 .. contents:: **Table of Contents**
 
@@ -47,7 +47,7 @@ Available states
 
 ``influxdb``
 ^^^^^^^^^^^^
-Installs InfluxDB from [provided packages](http://influxdb.com/download/)
+Installs InfluxDB from [provided packages](http://influxdb.com/download/).
 
 At the moment you **have** to specify the InfluxDB version in the
 ``influxdb:version`` pillar.
@@ -83,12 +83,13 @@ Requirements
 * Docker
 
 .. code-block:: bash
+
    $ gem install bundler
    $ bundle install
    $ bin/kitchen test [platform]
 
-Where ``[platform]`` is the platform name defined in ``kitchen.yml``, e.g. ``debian-9-2019-2-py3``.
-
+Where ``[platform]`` is the platform name defined in ``kitchen.yml``,
+e.g. ``debian-9-2019-2-py3``.
 
 ``bin/kitchen converge``
 ^^^^^^^^^^^^^^^^^^^^^^^^
@@ -114,3 +115,4 @@ Runs all of the stages above in one go: i.e. ``destroy`` + ``converge`` + ``veri
 ^^^^^^^^^^^^^^^^^^^^^
 
 Gives you SSH access to the instance for manual testing.
+

influxdb/config_defaults.yaml

@@ -1,3 +1,6 @@
+# -*- coding: utf-8 -*-
+# vim: ft=yaml
+---
 '0':
   '13':
     admin:

influxdb/defaults.yaml

@@ -1,3 +1,6 @@
+# -*- coding: utf-8 -*-
+# vim: ft=yaml
+---
 influxdb:
   config: '/etc/influxdb/influxdb.conf'
   conf: {}
@@ -14,7 +17,7 @@ influxdb:
   system_group: 'influxdb'
   system_user: 'influxdb'
   toml_module: toml
-  use_wget_on_install: True
+  use_wget_on_install: true
   tmpl:
     config: 'salt://influxdb/files/influxdb.config.jinja'
     etc_default: 'salt://influxdb/files/influxdb.etc_default'

pillar.example

@@ -1,7 +1,10 @@
+# -*- coding: utf-8 -*-
+# vim: ft=yaml
+---
 influxdb:
   version: 0.12.0
   no_conf_defaults: false
-  use_wget_on_install: True
+  use_wget_on_install: true
   logging:
     directory: '/var/log/influxdb'
     file: 'influxd.log'

test/salt/pillar/influxdb.sls

@@ -1,8 +1,10 @@
+# -*- coding: utf-8 -*-
+# vim: ft=yaml
 ---
 influxdb:
   version: 0.12.0
   no_conf_defaults: false
-  use_wget_on_install: True
+  use_wget_on_install: true
   logging:
     directory: '/var/log/influxdb'
     file: 'influxd.log'