/etc/sudoers.d/jenkins file only provided by j-d-g pp plugin

[nuxwin]

@mika

When installing j-d-g in existing Jenkins environment, the /etc/sudoers.d/jenkins is not installed. From my PoV, that file should be installed by the j-d-g package and not by the j-d-g pp plugin.

At least for now, please update the manual documentation to warn the user that this file will be missing when installing j-d-g without running apply.sh.

Thanks.