Sumo refresh

Update external subtrees to latest Yocto sumo.

Change-Id: I8364f32bef079841c6e57f1c587f4b1bedf62fef
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/poky/meta/classes/mirrors.bbclass b/poky/meta/classes/mirrors.bbclass
index b331afc..ed53dfb 100644
--- a/poky/meta/classes/mirrors.bbclass
+++ b/poky/meta/classes/mirrors.bbclass
@@ -1,4 +1,5 @@
 MIRRORS += "\
+${DEBIAN_MIRROR}	http://snapshot.debian.org/archive/debian/20180310T215105Z/pool \n \
 ${DEBIAN_MIRROR}	http://snapshot.debian.org/archive/debian-archive/20120328T092752Z/debian/pool \n \
 ${DEBIAN_MIRROR}	http://snapshot.debian.org/archive/debian-archive/20110127T084257Z/debian/pool \n \
 ${DEBIAN_MIRROR}	http://snapshot.debian.org/archive/debian-archive/20090802T004153Z/debian/pool \n \