Add grading system.

[pintos-anon] / src / tests / vm / Rubric.functionality

Functionality of virtual memory subsystem:

- Test page table.

6       pt-grow-stack
6       pt-big-stk-obj
6       pt-grow-pusha

- Test paging behavior.

2       page-linear
3       page-parallel
3       page-shuffle
5       page-merge-seq
5       page-merge-par

- Test "mmap" system call.

2       mmap-read
2       mmap-write
2       mmap-shuffle

2       mmap-twice

2       mmap-unmap
1       mmap-exit

3       mmap-clean

2       mmap-close
2       mmap-remove