409028 - Jetty HttpClient does not work with proxy CONNECT method.

The problem was due to the fact that the server replied with HTTP/1.0
to the CONNECT request; because of this, the parser was set as non
persistent, and the tunnel was immediately closed.

Now we are setting the parser as persistent if the method is a CONNECT,
no matter what HTTP version the server specifies.
Fixed proxy test.
Increase external proxy test timeout.
Merge branch 'jetty-7' into release-7
set for release
[maven-release-plugin] prepare release jetty-7.6.12.v20130725
[maven-release-plugin] prepare for next development iteration