Improved DomainUpgradeTest

- no shared domain which should be disposed by next executing test,
  now tests prepare init database state for themselves and dispose domains
  they've produced.
- added explicitly launched tests for parts of model, which helps to track
  problems in any happens by isolating part of the model instead of
  having 100s of changes in upgrade sequence. Main complex upgrade is called
  as main
- organized types of model parts into two arrays and most of the time
  use array segments to get subset of the types.
- places where full namespaces needed where replaces with single storage
  of namespace - dictionary or constant string, which allow to change namespaces
  for all mentions at once.

Author: alex-kulakov