Remove `onehost importvm` command

[paczerny]

Description The support for imported VMs is limited, no backups, no network managament. It may bring more issues then benefits.

Use case

Interface Changes onehost imporvm removed from CLI and Sunstone No API changes

Additional Context

Progress Status

• [ ] Code committed
• [ ] Testing - QA
• [ ] Documentation (Release notes - resolved issues, compatibility, known issues)