[development] Time to remove poll module from core

[Moshe Weitzman]

> Before we go overboard on this, do not take them out of core until
> someone takes each one and give it the necessary TLC (tender loving
> care).
> 
> Unmaintained modules just fall off the face of the earth. Look at queue
> module and where it has been in over a year. Not a single commit!

Core is not an orphanage. It does not nurse unloved modules. If noone cared
about queue.module in contrib, that's means it should have been kicked out
of core a long time ago.