govc: ignore ManagedObjectNotFound errors in 'find' command
govc: ignore ManagedObjectNotFound errors in 'find' command

It is possible for objects to be deleted after ContainerView.Find has returned.
In which case the inventory path lookup can result in ManagedObjectNotFound.
Ignore objects in this case, instead of returning an error.

Fixes #1908

bruceadowns/govmomi,vmware/govmomi,vmware/govmomi,bruceadowns/govmomi,bruceadowns/govmomi,vmware/govmomi