Xenapi: Allow windows builds with xentools 6.1 and 6.2

Building a windows VM with pre-installed xentools
6.1 or 6.2 requires device_id to be set on XEN VM record.

Requires xenapi_device_id to be set on the
image metadata, which is then used to set the device_id
on the vm record.

DocImpact

Implements: blueprint allow-windows-builds-with-xentools6-1-and-6-2
Change-Id: Id3cd9d569519f2df1afa046ddabf33f00d63c615
Merge "Xenapi: Allow windows builds with xentools 6.1 and 6.2"