Reprepro root dir only created by j-d-g pp plugin

[nuxwin]

@mika

The reprepro rootdir (default to /srv/reprepro) is not be created by the build-and-provide-package (or underlying) script. It is only reated by j-d-g pp plugin. This doesn't cover case of j-d-g being installed manually (existing jenkins environment).

[mika]

But scripts/generate-reprepro-codename also generates the repository, or is there any use case where this actually fails for you?