Run all tests under CI

[Totktonada]

It was blocked by an old tarantool-python submodule in test-run (tarantool/test-run#126) as @kbelyavs says, but now it does not.

[Totktonada]

test-run tests are not run with python setup.py test.

• Add them to Makefile (make test that depends on unit).
  • Alternative: add them somehow to python setup.py test. Not sure due to submodule.
  • Alternative: rewrite them to just python as unit tests. Not sure, because test-run is a kind of standard method to write tests.
• Add git submodule update --recursive --init to test.sh.
• Replace python setup.py test with make test in test.sh.