add newlines at end of some package files

var/spack/repos/builtin/packages/amg2013/package.py

var/spack/repos/builtin/packages/aspa/package.py

var/spack/repos/builtin/packages/cohmm/package.py

var/spack/repos/builtin/packages/cosp2/package.py

var/spack/repos/builtin/packages/lulesh/package.py

var/spack/repos/builtin/packages/smc/package.py