gnupg.org-hosted recipes: Change SRC_URI to https site
https version seems more reliable and in an informal test fetching
all gnupg recipes now takes <20% of the time it used to.
Define GNUPG_MIRROR in bitbake.conf so future tweaks to this are
easier. Replace some slower mirrors with the official ftp site
and another from gnupg.org mirror list.
Set UPSTREAM_CHECK_URI in all recipes that need it to
"https://gnupg.org/download/index.html" as the directory listings
are not up-to-date.
Signed-off-by: Jussi Kukkonen <jussi.kukkonen@intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
