Make 'tarantool' and 'test-run.py' runnable on FreeBSD

test/tarantool

-#! /usr/bin/python 
+#!/usr/bin/env python 
 """A simplistic client for tarantool/box: administrative
 console and SQL client.
 

test/test-run.py

-#! /usr/bin/python
+#!/usr/bin/env python
 """Tarantool regression test suite front-end."""
 
 __author__ = "Konstantin Osipov <kostja.osipov@gmail.com>"