It turns out that relative path in the property
`<property name="file" value="src/checkstyle/checkstyle-suppressions.xml"/>`
in some cases is resolved against a Gradle deamon dir as a root for configs
* Fix Checkstyle plugin config to use an absolute path in the project for
the `configDirectory`.
* Since `configDirectory` is exposed as a Checkstyle config variable,
we can use its `${config_loc}` placeholder to rely on the absolute path
in the project
f047f0528b