SSH2: Disallow the none MAC.
SSH2: Disallow the none MAC.

creatuity/phpseclib,melya/phpseclib,thaigialai1987/phpseclib,phpseclib/phpseclib,splitice/phpseclib,metaclassing/phpseclib,kenichiii/phpseclib,terrafrost/phpseclib,metaclassing/phpseclib,kenichiii/phpseclib,creatuity/phpseclib,danog/phpseclib,paragonie-scott/phpseclib,thaigialai1987/phpseclib,melya/phpseclib,danog/phpseclib,splitice/phpseclib,paragonie-scott/phpseclib