eww/url: www connections left "open"

[raman <raman@google.com>]

This is in emacs from Git@Head -- though the issue has been around for
a long time.

If you use EWW to open a Web site -- say 
http://www.cnn.com  ---  then do M-x list-processes --- you see  that
there is a "open" connection to www.cnn.com hanging around (likely
because of http keep-alive?) -- not sure. 

There is no such connection hanging around if you open www.gnu.org.

Most of the time, this is harmless and the connections go away ---
except when they dont, and if more than a few of these hang around,
then opening other URLs with EWW produces nothing. Killing those
hanging connections with delete-process immediately gets EWW working
again --- e.g. killing those connections with  the following loop:

(cl-loop 
 for p in (process-list)
 when (string-match "www" (process-name p))
 do (delete-process p))

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