subr_http.py: comment-out code for verbose http

Surprisingly, when in verbose mode, HTTP code writes what is
going on to the standard output.
subr_rss.py: remove code for fetching RSS from URL

I will move this functionality to the main.py file, to make
the code more clear.

While there, avoid warning by removing unused `encoding`
variable.
rss_fetch: also include site name in the destination folder