Adjust dom0 sched-credit weight based on default libvirt value for VMs
Adjust dom0 sched-credit weight based on default libvirt value for VMs

While default value for VMs is normally 256, libvirt set it to
(hardcoded) 1000. So adjust dom0 accordingly.

Fixes QubesOS/qubes-issues#1404

woju/qubes-core-admin,marmarek/qubes-core-admin,marmarek/qubes-core-admin,woju/qubes-core-admin,QubesOS/qubes-core-admin,marmarek/qubes-core-admin,QubesOS/qubes-core-admin,woju/qubes-core-admin,woju/qubes-core-admin,QubesOS/qubes-core-admin