travis: allow Python 2.6 to fail until we figure out why Travis hangs (#9776)
travis: allow Python 2.6 to fail until we figure out why Travis hangs (#9776)


LLNL/spack,iulian787/spack,iulian787/spack,iulian787/spack,LLNL/spack,LLNL/spack,iulian787/spack,LLNL/spack,iulian787/spack,LLNL/spack