Make runqftasm.sh friendlier for Ubuntu 18.04

[shinh]

Also use set -e to make it easier to identiy failed commands.

[woodrush]

Sorry, I accidentally force-pushed to this repository before noticing your pull request. Could you please rebase it to the current head so I could merge it?
Sorry, never mind, I decided to roll back my master branch, merge your commit, and put my further edits on top of your commit. Thanks for the pull request!

[woodrush]

@shinh Sorry, I messed up on rebasing and merging the pull request, and accidentally ended up with this commit history (add-qftasm-backend), which has a duplicate commit. I squashed the three top commits on this branch and got this commit history (master) which removes the duplicate, but the "Verified" badge on GitHub's merge commit disappeared. If we want to keep the "Verified" badge, we could send a pull request to this branch (add-qftasm), and merge your commit there again. We could also keep the current master branch which has no duplicate but without GitHub's merge commit. How should we handle this? I'm sorry for the complications.