[465474] Use rootFolder in Linux Oomph Installer download archive
[465474] Use rootFolder in Linux Oomph Installer download archive

https://bugs.eclipse.org/bugs/show_bug.cgi?id=465474
peterkir/org.eclipse.oomph,peterkir/org.eclipse.oomph,peterkir/org.eclipse.oomph,peterkir/org.eclipse.oomph,peterkir/org.eclipse.oomph