Fix the bats test script
Fix the bats test script

I had the wrong directories in the bats script, and this fixes that.
I also used [this trick](https://github.com/sstephenson/bats/issues/3#issuecomment-382664336)
to get the client to only run once instead of once per test, which
makes things go a lot faster.

UMM-CSci-Systems/Segmented-file-system-client,UMM-CSci-Systems/Segmented-file-system-client