Use version 6.1.1 of checkstyle library
Use version 6.1.1 of checkstyle library

The version used by the checkstyle maven plugin doesn't support Java 8,
so override it manually until the plugin is fixed

bd-dev-mobileum/presto,bd-dev-mobileum/presto,bd-dev-mobileum/presto,bd-dev-mobileum/presto,bd-dev-mobileum/presto