Short term archiving bug

I ran into what looks like a short term archiving bug.

For a hybrid run, mpas needs access to restart files from a previous simulation (at every restart). To avoid any naming convention problem with the restart files being written by the model, I renamed these files:

```
"mpaso.rst.0331-01-01_00000.nc" -> "mpaso.rst.0331-01-01_00000_init.nc"
"mpascice.rst.0331-01-01_00000.nc" -> "mpascice.rst.0331-01-01_00000_init.nc"
```
However, when I ran short term archiving, st_archive did not recognize the non-standard name and moved these files in the restart subdir for 0331-01-01 as if there were actual restart files.

On the next restart, my job failed because mpaso could not find "mpaso.rst.0331-01-01_00000_init.nc".