This commit looks to see if FETCHCMD_s3 is set and if not, sets
it.
This is needed because I've use cases where I don't use aws, but
s3cmd (due to license).
(Bitbake rev: fdeaed70a7d1ff8be1a1de937cb864130b0c2c86)
Signed-off-by: Elizabeth 'pidge' Flanagan <pidge@toganlabs.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>