scripts/kernelng: subcommand help text

Signed-off-by: Gregory M. Turner <gmt@be-evil.net>
scripts/kernelng: spiff up help for main command

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

Fixes some text-wrapping bugs and allows us to drop the duplicated
click code from KNGHelpFormatter.write_usage

Monkey patches click.formatting's wrap_text function with
our ANSI-friendly implementation.

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