Merge pull request xapi-project#3333 from robhoes/master

CA-272126: Don't get NVidia vGPU types from XML file for now.

Merge pull request xapi-project#3328 from mseri/CA-271052

CA-271052: pool join fixup

CA-270642, CA-265691: Copy metrics from snapshot when reverting

Do not copy the metrics reference from the `snapshot_metadata`, because this
comes from the original VM (the one that the snapshot was taken of), and may
have been destroyed meanwhile. The snapshot itself has a copy of the VM_metrics
record of the original VM at the time the snapshot was taken, so copy that
when restoring the VM.

This applies to snapshots as well as checkpoints.

Signed-off-by: Rob Hoes <[email protected]>

Merge pull request xapi-project#3317 from robhoes/usb-passthrough

USB passthrough

Merge pull request xapi-project#3268 from gaborigloi/feature/CBT_test…

…_network_purpose_setters

 Test network.add,remove_purpose calls

Merge pull request xapi-project#3287 from xapi-project/feature/CBT

[CBT merge] Merge recent CBT changes into master

Merge pull request xapi-project#3278 from xapi-project/REQ-528

Restrictions updates

Merge pull request xapi-project#3259 from robhoes/master

Revert "CA-266936: pciutils: use the file dump in a temp file if poss…

Merge pull request xapi-project#3256 from robhoes/master

Revert "CA-223754 move periodic scheduler to a monotonic clock"

Merge pull request xapi-project#3243 from sharady/merge-req-540

Merge REQ-540