DCO: use IANA-reserved second level domain name

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Domen Puncer <domen@coderock.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Update DCO ("signoff") rules to 1.1

This adds a clause that notes explicitly that the person doing the
sign-off knows that the project (and his sign-off) is public and will
possibly get archived and re-distributed.

Start documenting the sign-off procedure in SubmittingPatches

We already have over 200 sign-off lines in the kernel, so
let's document the thing, even if discussion may still be
on-going.

[wking@tremily.us: removed diff context since I'm pulling out only the
D-C-O portion of SubmittingPatches]
Signed-off-by: W. Trevor King <wking@tremily.us>