Bug 1387862 - Lint the linter config yaml files themselves. r=ahal

We should have CI Lint YAML files in the tree.

MozReview-Commit-ID: F8hTBerSNIj

--HG--
extra : rebase_source : 2d1d3d8d98fd3f0abe3494c49ad01072181c4e08

tools/lint/eslint.yml

@@ -1,3 +1,4 @@
+---
 eslint:
     description: JavaScript linter
     # ESLint infra handles its own path filtering, so just include cwd

tools/lint/flake8.yml

@@ -1,3 +1,4 @@
+---
 flake8:
     description: Python linter
     include:

tools/lint/wpt.yml

@@ -1,3 +1,4 @@
+---
 wpt:
     description: web-platform-tests lint
     include:

tools/lint/wpt_manifest.yml

@@ -1,3 +1,4 @@
+---
 wpt_manifest:
     description: web-platform-tests manifest lint
     include:

tools/lint/yaml.yml

@@ -1,3 +1,4 @@
+---
 yamllint:
     description: YAML linter
     include:
@@ -5,6 +6,8 @@ yamllint:
         - python/mozlint/
         - security/nss/.taskcluster.yml
         - taskcluster
+        - testing/mozharness
+        - tools
     extensions: ['yml', 'yaml']
     type: external
     payload: yamllint_:lint