This also changes to use -t 2 -T 30 as the defaults which are more sane for
a modern fetcher and already specified in OpenEmbedded metadata.
(Bitbake rev: bf0e5dddf0f63cdb0648fb6d872af5ceef6fbfb0)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>