This commit is necessary to introduce proxy fetchers and do not modify
the behavior of existing fetchers.
This commit allows fetchers to forwards the "verify_donestamp" and
"update_stamp" functions to a proxy fetcher.
(Bitbake rev: f7612c0704b4252bba5157ce9a94d8888c6d0760)
Signed-off-by: Jean-Marie LEMETAYER <jean-marie.lemetayer@savoirfairelinux.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>