Before:
virsh # dominfo chx3
State:          shut off
Max memory:     92160 KiB
Used memory:    92160 KiB

After:
virsh # dominfo container1
State:          shut off
Max memory:     92160 KiB
Used memory:    0 KiB

Similar to qemu cases.
Signed-off-by: NChen Hanxiao <chenhanxiao@cn.fujitsu.com>