Rename ClientCert.check_expired to assert_not_expired to emphasize that it's raising an exception on failure
Rename ClientCert.check_expired to assert_not_expired to emphasize that it's raising an exception on failure

git-svn-id: d4dac5d1b57f4ff5e3fed9c080589c4820ad2c03@19663 4e558342-562e-0410-864c-e07659590f8c

matyasselmeci/osg-build,opensciencegrid/osg-build,opensciencegrid/osg-build,matyasselmeci/osg-build