Build: Ignore local /test/integration/*/ files for ESLint

For example `/test/integration/nyc/coverage/index.html` is a
local artefact that exists after running the integration tests.

Note that we do still run eslint on `/test/integration/*.js`, only
sub directories are ignored.

.eslintrc.json

@@ -38,7 +38,7 @@
         "docs/_site/**",
         "lib/**",
         "qunit/**",
-        "test/integration/*/qunit/**",
+        "test/integration/*/**",
         "temp/**"
     ],
     "overrides": [