Revert "XCOMMONS-1643: Upgrade to Maven Checkstyle Plugin 3.1.0"
Revert "XCOMMONS-1643: Upgrade to Maven Checkstyle Plugin 3.1.0"

This reverts commit b451cc8a88fb1f6ead932286a3d142cee5013ac9.

xwiki/xwiki-commons,xwiki/xwiki-commons