Revert "Issue #2116: use checkstyle fork of xwiki with fix to pass CI build"
Revert "Issue #2116: use checkstyle fork of xwiki with fix to pass CI build"

This reverts commit 2d1a926ffb2ceabdfe856406332e34772c17aca1.

checkstyle/checkstyle,rnveach/checkstyle,checkstyle/checkstyle,romani/checkstyle,romani/checkstyle,rnveach/checkstyle,rnveach/checkstyle,checkstyle/checkstyle,romani/checkstyle,rnveach/checkstyle,rnveach/checkstyle,rnveach/checkstyle,checkstyle/checkstyle,checkstyle/checkstyle,checkstyle/checkstyle,romani/checkstyle,romani/checkstyle,romani/checkstyle