qemu: save domain status after set memory parameters
qemu: save domain status after set memory parameters

After set memory parameters for running domain, save the change to live
xml is needed otherwise it will disappear after restart libvirtd.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1211548
Signed-off-by: Shanzhi Yu <98ab354c31cd9189e8ce8ab338c511d403e2f789@redhat.com>
Signed-off-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>

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