CP-5643: Export the types of VGPUs

Signed-off-by: John Else <john.else@citrix.com>
CP-5643: Add relevant VGPU_types to the export table

Signed-off-by: John Else <john.else@citrix.com>
CP-5643: Import VGPU_type objects

Signed-off-by: John Else <john.else@citrix.com>
CP-5643: Fix DB filter

Signed-off-by: John Else <john.else@citrix.com>
Merge pull request #1399 from johnelse/cp-5643

Fixes for import/export of VGPUs and their types