New, optimized hosts file

Removed all comment lines, and checked those urls marked
as [server down?] to see if they were still valid, and
removed them if they were not.

This should be a much more streamlined version, and much
smaller, as the system has to read each line when checking
the hosts file for a url, so this speeds it up a LOT.

Change-Id: I9889a915e038bfae1d5704e780b03e055969a7bd