Adding new types to simplify access to ManagedObjectType.

Current implementation of the ManagedObjectType is quite complicate,
it has a lot of nested elements and those it is hard to access them.
These new definitions makes the definition more readable and used in
code will improve operations on nested types of the ManagedObjectType.

Tests:
    This change is just a definition and does not requires additional
    tests.

Signed-off-by: Zbigniew Kurzynski <zbigniew.kurzynski@intel.com>
Change-Id: Icadd57653262009e60e3b4391607d22fa4b7be6b