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ARROW-4640: [Python] Add docker-compose configuration to build and test the project without pandas installed

```bash
make -f Makefile.docker python-nopandas
make -f Makefile.docker run python-nopandas
```

OR

```bash
$ docker-compose build cpp
$ docker-compose build python
$ docker-compose build python-nopandas
$ docker-compose run --rm python-nopandas
```

The tests will fail until [ARROW-4794: [Python] Make pandas an optional test dependency](https://issues.apache.org/jira/browse/ARROW-4794) is implemented.

Author: Krisztián Szűcs <szucs.krisztian@gmail.com>

Closes #3833 from kszucs/ARROW-4640 and squashes the following commits:

1b77cc93 <Krisztián Szűcs> rename servers to tests in the docker makefile
3794a5f4 <Krisztián Szűcs> license header
294bb97b <Krisztián Szűcs> test without pandas installed