SSH2: Continue Subsystem Implementation.
SSH2: Continue Subsystem Implementation.

Removed unused piece of code @2352.
Added $this->_get_interactive_channel() to reset(). Unless we don't want to close the subsystem channel?? Leaving that decision up to you.
phpseclib/phpseclib,thaigialai1987/phpseclib,creatuity/phpseclib,kenichiii/phpseclib,danog/phpseclib,kenichiii/phpseclib,metaclassing/phpseclib,terrafrost/phpseclib,paragonie-scott/phpseclib,paragonie-scott/phpseclib,melya/phpseclib,danog/phpseclib,splitice/phpseclib,thaigialai1987/phpseclib,melya/phpseclib,splitice/phpseclib,creatuity/phpseclib,metaclassing/phpseclib