Actually reapply r18784, replacing su with runuser (previous commit 18797 actually adds a proxy cleanup test)
Actually reapply r18784, replacing su with runuser (previous commit 18797 actually adds a proxy cleanup test)

git-svn-id: 884a03e47e2adb735d896e55bb5ad6bc3421ba19@18799 4e558342-562e-0410-864c-e07659590f8c

efajardo/osg-test,efajardo/osg-test