libiconv must be installed before tarantool build. Otherwise iconv test
will fails.
More info: https://github.com/tarantool/tarantool/issues/3791

python-daemon is not used anymore:
https://github.com/tarantool/test-run/commit/8797cb15bf34f8c70519221b3b9c78f08696aba6
https://github.com/tarantool/tarantool/commit/130cf4659bf938d1fa1bf0e936b0a43a53fa8dcb



python-msgpack is enabled in test-run as a submodule, while
python-gevent and python-yaml are actually used in test-run.

Signed-off-by: Pavel Balaev <balaev@tarantool.org>