add osg 3.5 repositories and gpg keys

etc/pki/rpm-gpg/RPM-GPG-KEY-OSG

etc/pki/rpm-gpg/RPM-GPG-KEY-OSG-2

etc/yum.repos.d/devops-itb.repo

etc/yum.repos.d/devops.repo

etc/yum.repos.d/osg-contrib.repo

etc/yum.repos.d/osg-development.repo

etc/yum.repos.d/osg-empty.repo

etc/yum.repos.d/osg-minefield.repo

etc/yum.repos.d/osg-prerelease.repo

etc/yum.repos.d/osg-rolling.repo

etc/yum.repos.d/osg-testing.repo

etc/yum.repos.d/osg-upcoming-development.repo

etc/yum.repos.d/osg-upcoming-minefield.repo

etc/yum.repos.d/osg-upcoming-prerelease.repo

etc/yum.repos.d/osg-upcoming-rolling.repo

etc/yum.repos.d/osg-upcoming-testing.repo

etc/yum.repos.d/osg-upcoming.repo

etc/yum.repos.d/osg.repo