Cleared X11 forwarding for 'ext' (ssh) and 'no' (ssh) auth types, which was causing...

Cleared X11 forwarding for 'ext' (ssh) and 'no' (ssh) auth types, which was causing sandbox violations for root's .xauth when users had ForwardX11 turned on system-wide; fixed 'no' auth type (mainly used in cvs fetching GNUstep related ebuilds) to act as 'ext' (ssh) acts as appropriate, removing need for duplication of logic in code; removed redundant StrictHostKeyChecking option passed to the ssh command when 'ext' (ssh) auth type is used; tested with CVS fetching ebuilds other than the ones I maintain to make sure I didn't break anything ;-)