Correct API versioning for the vdi.copy extension

Signed-off-by: Rob Hoes <rob.hoes@citrix.com>
Bump API version to 2.2

Signed-off-by: Rob Hoes <rob.hoes@citrix.com>
datamodel: VDI.copy was extended in clearwater-felton, not clearwater

Signed-off-by: Rob Hoes <rob.hoes@citrix.com>