Remove unnecessary slob checks in lab6

Signed-off-by: Junjie Mao <eternal.n08@gmail.com>
Temporarily reduce MAX_TIME_SLICE in lab6

This is for better accuracy in priority testing.

Signed-off-by: Junjie Mao <eternal.n08@gmail.com>
Solutions to lab6 (still buggy)

Signed-off-by: Junjie Mao <eternal.n08@gmail.com>