hst: expose scheduling priority

This is useful when limits are configured to allow it.

Signed-off-by: Ophestra <cat@gensokyo.uk>

test/test.py

@@ -210,10 +210,10 @@ print(machine.succeed('grep "shim: got SIGCONT from unexpected process$" /tmp/sh
 sched_unset = int(machine.succeed("sudo -u alice -i hakurei -v run cat /proc/self/sched | grep '^policy' | tr -d ' ' | cut -d ':' -f 2"))
 if sched_unset != 0:
     raise Exception(f"unexpected unset policy: {sched_unset}")
-sched_idle = int(machine.succeed("sudo -u alice -i hakurei -v run --sched=idle cat /proc/self/sched | grep '^policy' | tr -d ' ' | cut -d ':' -f 2"))
+sched_idle = int(machine.succeed("sudo -u alice -i hakurei -v run --policy=idle cat /proc/self/sched | grep '^policy' | tr -d ' ' | cut -d ':' -f 2"))
 if sched_idle != 5:
     raise Exception(f"unexpected idle policy: {sched_idle}")
-sched_rr = int(machine.succeed("sudo -u alice -i hakurei -v run --sched=rr cat /proc/self/sched | grep '^policy' | tr -d ' ' | cut -d ':' -f 2"))
+sched_rr = int(machine.succeed("sudo -u alice -i hakurei -v run --policy=rr cat /proc/self/sched | grep '^policy' | tr -d ' ' | cut -d ':' -f 2"))
 if sched_rr != 2:
     raise Exception(f"unexpected round-robin policy: {sched_idle}")