Update containerd to current master

- now supports image pull and run end to end
- update runc to last version before spec update fix #1302
- remove ext2 utils from init

Signed-off-by: Justin Cormack <justin.cormack@docker.com>

pkg/init/Dockerfile

@@ -5,8 +5,6 @@ RUN \
   apk --no-cache upgrade -a && \
   apk --no-cache add \
   dhcpcd \
-  e2fsprogs \
-  e2fsprogs-extra \
   && rm -rf /var/cache/apk/*
 
 COPY . ./