CP-24185 add Gpumon_server.get_vgpu_metadata()
CP-24185 add Gpumon_server.get_vgpu_metadata()

This adds get_vgpu_metadata() to obtain the meta data for all vGPUs
of a domain.

Signed-off-by: Christian Lindig <4f88b50bc9dba63c9a7d9e208d4b3ac6f1a52800@citrix.com>

xenserver/gpumon