Use described_class when possible

spec/initializers/settings_spec.rb

spec/lib/disable_email_interceptor_spec.rb

spec/lib/event_filter_spec.rb

spec/lib/extracts_path_spec.rb

spec/lib/file_size_validator_spec.rb

spec/lib/gitlab/bitbucket_import/importer_spec.rb

spec/lib/gitlab/bitbucket_import/project_creator_spec.rb

spec/lib/gitlab/ci_access_spec.rb

spec/lib/gitlab/conflict/file_spec.rb

spec/lib/gitlab/conflict/parser_spec.rb

spec/lib/gitlab/database/migration_helpers_spec.rb

spec/lib/gitlab/diff/highlight_spec.rb

spec/lib/gitlab/diff/parser_spec.rb

spec/lib/gitlab/git/hook_spec.rb

spec/lib/gitlab/git/rev_list_spec.rb

spec/lib/gitlab/git_access_spec.rb

spec/lib/gitlab/git_access_wiki_spec.rb

spec/lib/gitlab/git_ref_validator_spec.rb

spec/lib/gitlab/git_spec.rb

spec/lib/gitlab/gitlab_import/client_spec.rb