release v0.51.0

Avoid using container/podman in manager.go

Signed-off-by: Davanum Srinivas <[email protected]>

Unit test: MachineInfo Clone() method

Add a unit test that ensures that Clone()
method clones all fields and that the cloned
struct equals the original.

To avoid missing fields in the future, the test
fails if one of the struct's fields is populated
with a zero-value. The unit test uses reflection
to achieve that.

Signed-off-by: Itamar Holder <[email protected]>