output-directory option has no effect

[kpgriesser]

1 - Detailed description of problem or enhancement
We'd like to have large output files like checkpoints go to a /tmp disk but have been unable to do this using the --output-directory command line option.

2 - Describe how to reproduce the issue

• attempt 1: does it create 'out' if not exists or give error? [no]
  $ sst --output-directory=out --checkpoint-period=10ns ../sdl.py > log
  $ ls
  checkpoint/ log

• attempt 2: if 'out' exists does output get there? [no]
  $ mkdir out
  $ sst --output-directory=out --checkpoint-period=10ns ../sdl.py > log
  $ ls
  checkpoint/ checkpoint_1/ log out/
  $ ls out

3 - What Operating system(s) and versions
any

4 - What versions of external libraries (MPI, etc.)
n/a

5 - Provide sha1 of all relevant SST repositories (sst-core, sst-elements, etc)
sst-core