Improvements when establishing a Socks5 bytestream:

• checks if target supports Socks5 feature (http://xmpp.org/extensions/xep-0065.html#proto-disco)

• while searching for Socks5 proxies all non Socks5 proxies are blacklisted to not query them again in next negotiation

• prioritizes last working stream host (if exists) under the assumption that it will also work best for further requests

• configurable timeout for the response of target to the request (was a constant in old implementation)

• uses specialized Socks5ClientForInitiator to connect to local or remote proxy and activate the stream

• returns Socket for bidirectional use

• test for establishing Socks5 bytestreams

• handels all cases mentioned in the XEP-0065 (http://xmpp.org/extensions/xep-0065.html#usecase)

• test for Socks5ClientForInitiator