ZF-2946: Zend_Http_Client_Adapter_Socket be able to set stream context options

Description

On a shared host making an out going connection I need to bind to a certain ip address. This is only possible though steam context handlers. Zend_Http_Client_Adapter_Socket already uses stream_context_create. I propose the ability to be able to pass stream context options via the config.

Comments

Changing fix version to follow IT conventions.

Please categorize/fix as needed.

Implemented, documented and tested in CS-17009