ca-certificates: update to 20170717

ca-certificates: update to 20170717

This is actually the same version as previously; upstream didn't have
a tag for it before and now it does, so we can reduce confusion. The SRCREV
change is due to a few added commits which modify upstream's debian
packaging (not used by us).

Signed-off-by: Alexander Kanavin <alexander.kanavin@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
(cherry picked from commit 8359730165908025b0762eaa25569e2fdcd9d086)
Signed-off-by: Andreas Oberritter <obi@opendreambox.org>