* Fix persistance issue found, see ESP8266 issue #6152
* Correcting the parsing of the header for HTTP1.0
* Send 'Connection: Close' header in case of HTTP1.0
* Let reuse connection depend on protocol used: HTTP1.0 or HTTP1.1
* Fixed reuse, added null ptr checks, added check for _trainsportTraits in connect() in case _client was set null
* Fix reuse connection issues, similar to ESP8266 PR #6176