Fix Smith CI

[chapman39]

Smith CI has been running only Serac tests due to an issue with using symlinks! This MR attempts to resolve this.

EDIT: Turns out the fix was within Smith. The remaining changes here are minor cleanups.

[white238]

This being broken in this way actually has more implications than we think. Anywhere that get_repo_dir is called needs to be reviewed or that function needs to be fixed.

[white238]

Good catch btw....

[chapman39]

The previous solution didn't solve the problem all the way, since there were issues with get_project_name() returning serac instead of smith.

This new solution modified get_repo_dir() to find the smith dir if it's a serac submodule. The only catch with this solution is that you won't be able to build and test only serac if it's a submodule of smith.