PATCH: kio_http

[Dawit A.]

Hi,

Here is a patch for kio_http that fixes and/or modifies the following things, 
please review since it needs to be backported into 3_0_BRANCH as well

- Make HTTP authentication over a proxied SSL connection work.  Problem 
reported on kfm-devel by David Bishop.  This was broken when we were 
attempting to fix persistent connections.  It also showed me another bug 
where we were prematurely storing the authentication data which incorrectly 
resulted in the "Authentication Failed" dialog.

- Remove two function: unused httpIsConnected which I added at one time and 
subsequently forgot to remove.  And httpCloseConnection which is simply 
redundant to closeConnection.  closeConnection simply called 
httpCloseConnection.

- Re-do the persistent connection fix and handle it in one function httpClose 
instead of all the places we call httpCloseConnection now.  I only consider 
POST to be an idempotent method as per 2616. Still if we want we can change 
the check to only allow persistence for GET.

- Do not send back HTTP Version number as well as header meta-data unless the 
"PropagateHttpResponse" meta-data has been set.  Save some CPU cycles as 
Waldo suggested.

Regards,
Dawit A.
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