sched/deadline: Fix sparse static warnings
sched/deadline: Remove unused variables
sched/deadline: No need to check p if dl_se is valid
sched/core: Fix htmldocs warnings
sched: Preserve the nice level over sched_setscheduler() and sched_se…
…tparam() calls
sched: Fix up scheduler syscall LTP fails
sched: Fix up attr::sched_priority warning
sched: Move SCHED_RESET_ON_FORK into attr::sched_flags
kernel:sched:core.c: rewrite core.c and fix merge conflicts