syscalls/sched_setscheduler: add sched_setscheduler03

Test the scheduler behavior on fair processes without SYS_CAP_NICE
capability, it should allow process do this syscall if it's not growing
the priority.

Signed-off-by: Chunyu Hu <chuhu@redhat.com>
Acked-by: Jan Stancek <jstancek@redhat.com>
4 files changed