Fix inconsistency in python and haskell objects

Fix inconsistency in python and haskell objects

Currently hv/disk_state_static parameters are supported only for cluster
object properly. For node groups and nodes they were introduced in
2da9f556, however only on the python side. This could cause problems
during upgrades from old versions.

This patch adds hv and disk states fields to haskell objects as a
notSerializedDefaultField which will fix the problem without the changes
in behaviour. Also it modifies corresponding haskell arbitrary instances.

The patch is inspired by e78fb0d6 and 553363a3.

Signed-off-by: Oleg Ponomarev <oponomarev@google.com>
Reviewed-by: Klaus Aehlig <aehlig@google.com>