DM Hot-Add udev rules presence

Scripts for testing Hot-Add rules presence. VM is shut down, DM enabled
and restarted. After that a remote script tests if Hot-Add support is
enabled in the udev rules by searching after “SUBSYSTEM=="memory",
ACTION=="add", ATTR{state}="online" “ rule.
Fixed log deletion error
Restrict search to /lib/udev and /etc/udev
Added XML entry, removed redundant setup-script
Merge pull request #83 from thenoizz/dm_hot_add

DM hot-add udev rules presence