CA-96893: Remove metadata from xenopsd after a suspend.

Previously metadata was only removed after a shutdown.

Signed-off-by: John Else <john.else@citrix.com>
CA-96893: VM.remove now also removes the VmExtra persistent data.

Signed-off-by: John Else <john.else@citrix.com>
Merge pull request #1011 from johnelse/ca-96893

CA-96893: Remove xenopsd VmExtra metadata from filesystem after suspend and migrate.