- move test_self_activate_via_require and test_self_activate_deep_unambiguous to test_gem_specification.rb file.

- move loaded_spec_names and save_loaded_features
  to rubygems/test_case.rb
- move more activate test cases to test_gem_specification.rb - move some helper methods to rubygems/test_case.rb
move more activate test cases to test_gem_specification.rb
move more activate test cases to test_gem_specification.rb
move more activate test cases to test_gem_specification.rb
move test_self_activate_ambiguous_indirect_conflict to test_gem_specification.rb
refactor, added helper make_spec_c1 all tests green