xenlight: use the correct 'private' hotplug directory
xenlight: use the correct 'private' hotplug directory

When we plug a VBD we now use a directory based on the VM uuid, not the domid.

Signed-off-by: David Scott <63c9eb0ea83039690fefa11afe17873ba8278a56@eu.citrix.com>

djs55/xenopsd-previous,johnelse/xenopsd,simonjbeaumont/xenopsd,djs55/xenopsd,euanh/xenopsd,euanh/xenopsd,koushikcgit/xenopsd,simonjbeaumont/xenopsd,koushikcgit/xenopsd,euanh/xenopsd,djs55/xenopsd-previous,thomassa/xenopsd,koushikcgit/xenopsd,johnelse/xenopsd,djs55/xenopsd-previous,cheng--zhang/xenopsd,thomassa/xenopsd,djs55/xenopsd,simonjbeaumont/xenopsd,cheng--zhang/xenopsd,djs55/xenopsd,johnelse/xenopsd,cheng--zhang/xenopsd,thomassa/xenopsd