Skip testing multilocale lammps/lsms files under comm=none.
Merge pull request #755 from vasslitvinov/skip-multilocale-lammps-for-comm=none

Skip testing multilocale lammps/lsms files under comm=none.

These sets of tests:

  studies/lammps/shemmy/p-lammps-n1
  studies/lammps/shemmy/p-lammps-n2
  studies/lammps/shemmy/p-lammps-n4

and

  studies/lsms/shemmy/lsms-parallel-n1
  studies/lsms/shemmy/lsms-parallel-n2
  studies/lsms/shemmy/lsms-parallel-n4

differ only in .numlocales. So:

* Skipif ...-n2 and ...-n4 when comm=none.

* Change ...-n2.{chpl,good,execopts} and ...-n4.{chpl,good,execopts}
  to symlinks to the respective ...-n1.*
  to emphasize their same-ness.

When our testing system supports multiple numlocales for a single test,
the symlinks can just be deleted.

I debated whether to make ...-n2.chpl and ...-n4.chpl
just 'use' the respective ...-n1.chpl, instead of symlinks.
Then I realized that that was not an option because
the file names had dashes, and I was not up for renaming the files.

Reviewed by Lydia.