Add memory units to diagnostics log
Add memory units to diagnostics log

The troubleshooting log that can be obtained through a box properties
shows the current/max memory for the box. As this amount is in KiB,
this commit adds a unit to this log to make this explicit.

https://bugzilla.gnome.org/show_bug.cgi?id=694430

vbenes/gnome-boxes,vbenes/gnome-boxes