libwebsockets

keepalive fix flow now forced closed removed

Since 0d89f3cbed69a86251e6ed791c57e99a7f59c8d9 added recently,
http1.1 keepalive tries to actually keep alive.

Some updates are needed to keepalive flow to solve problems coming from
changes that were hidden until now by keepalive basically closing until
recently.  It's not very noticable since clients will retry as close is
the default 1.0 behaviour... anyway this lets me do

wget http://localhost:7681/test.html http://localhost:7681/test.html

using keepalive correctly on the test server.

Signed-off-by: Andy Green <andy.green@linaro.org>