setup: do not include test files

Include only `tarantool` package and subpackage code on install. Before
this patch, test suites were installed as well.

Part of #238

Author: DifferentialOrange

Diff for: CHANGELOG.md

@@ -199,6 +199,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Allow any MessagePack supported type as a request key (#240).
 - Puting test files in pip package (#238).
 - Make connection close idempotent (#250).
+- Do not install test files (#198).
 
 ## 0.9.0 - 2022-06-20