Replace position-of-the-moon

Replace position-of-the-moon with an inline ERB template. This avoids a
call to an external binary that needs to be shipped to servers. So we
purge the binary and delete it from the repo.
Note that ruby rand function does not include the upper bound while
python's random.randint does so 24 becomes 25. The srand call is there
because in puppetmaster environment the rand function is not seeded
correctly and always returns the same result

Change-Id: I735b2ce975fb2b84395a2a5520cd745ad158ac25