break client connect into states and apply timeout

break client connect into states and apply timeout

Doing a client connect was atomic until now, blocking
all the other service while it waited for proxy and / or
server response.

This patch uses the new timeout system and breaks the
client connect sequence into three states handled by
the normal poll() processing.  It means that there are
now no blocking network delays and it's all handled
by the main state machine.

Signed-off-by: Andy Green <andy@warmcat.com>