kernelng: Improve help

Spiff up the click help a lot.

Signed-off-by: Gregory M. Turner <gmt@be-evil.net>
config: subconsts: fix thinko

Signed-off-by: Gregory M. Turner <gmt@be-evil.net>
KNGConfig.writeConfigText: add a no_comments option

Signed-off-by: Gregory M. Turner <gmt@be-evil.net>
kernelng: full "config example" subcommand implementation

It actually works now, yay!

Signed-off-by: Gregory M. Turner <gmt@be-evil.net>