When making a HTTP request to a non-standard port, include the port in the Host header for the Streams HTTP transport. This bring parity to the cURL transport and respects the HTTP RFC.
Props kamelkev for the initial patch; Fixes #28982


git-svn-id: https://develop.svn.wordpress.org/trunk@29852 602fd350-edb4-49c9-b593-d223f7449a82