Finish implementing VM.recover.
Finish implementing VM.recover.

Use the functions in export.ml to create the objects to be imported,
before reimporting them into the main database.

Signed-off-by: John Else <37b74501daa612e48fea94f9846ed4ddeb6a8f07@citrix.com>

koushikcgit/xcp-networkd,sharady/xcp-networkd,koushikcgit/xcp-networkd,djs55/xcp-rrdd,koushikcgit/xcp-rrdd,johnelse/xcp-rrdd,simonjbeaumont/xcp-rrdd,koushikcgit/xcp-rrdd,johnelse/xcp-rrdd,simonjbeaumont/xcp-rrdd,robhoes/squeezed,koushikcgit/xcp-rrdd,djs55/xcp-rrdd,djs55/xcp-networkd,djs55/xcp-networkd,djs55/squeezed,sharady/xcp-networkd