Add grading system.

[pintos-anon] / src / tests / filesys / base / Rubric

Functionality of base file system:
- Test basic support for small files.
1       sm-create
2       sm-full
2       sm-random
2       sm-seq-block
3       sm-seq-random

- Test basic support for large files.
1       lg-create
2       lg-full
2       lg-random
2       lg-seq-block
3       lg-seq-random

- Test synchronized multiprogram access to files.
4       syn-read
4       syn-write
2       syn-remove