VMware: Remove class orphaned by ESX driver removal

HostState was only used by the ESX driver, which was removed in
change I718fc0ee67dbd625af00c20fa4e34b8a35015437.

Also remove LOG, which is no longer used following previous removals.

Change-Id: I22e30c01e5b5219df858219dc1fda335a83ad225
Merge "VMware: Remove class orphaned by ESX driver removal"