virt-libvirt: Add configuration for virsh schedinfo(posix on qemu/kvm).

Signed-off-by: Yu Mingfei <yumingfei@cn.fujitsu.com>
virt-libvirt: Add configuration for virsh schedinfo(credit on xen).

Signed-off-by: Yu Mingfei <yumingfei@cn.fujitsu.com>
virt-libvirt: Add test module for virsh schedinfo(posix on qemu/kvm)

Signed-off-by: Yu Mingfei <yumingfei@cn.fujitsu.com>
virt-libvirt: Add test module for virsh schedinfo(credit on xen)

Signed-off-by: Yu Mingfei <yumingfei@cn.fujitsu.com>