virt-libvirt: virsh.net_state_dict() bugfix

Signed-off-by: Chris Evich <cevich@redhat.com>
virt: add virsh function for virsh {at|de}tach-disk.

Signed-off-by: Li Yang <liyang.fnst@cn.fujitsu.com>
virt: add virsh function for virsh update-device

Signed-off-by: Li Yang <liyang.fnst@cn.fujitsu.com>
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>