[build]: use vfs storage driver to build dockers (#2016)

seen issues to build dockers using aufs in ubuntu 18.04

Immedidate dockers are exported to docker file and then
imported into sonic image. Thus, whether using vfs or aufs
as the storage driver does not matter for the immediate build.

Signed-off-by: Guohan Lu <[email protected]>

slave.mk

@@ -385,6 +385,7 @@ $(addprefix $(TARGET_PATH)/, $(SONIC_SIMPLE_DOCKER_IMAGES)) : $(TARGET_PATH)/%.g
 	$(HEADER)
 	# Apply series of patches if exist
 	if [ -f $($*.gz_PATH).patch/series ]; then pushd $($*.gz_PATH) && QUILT_PATCHES=../$(notdir $($*.gz_PATH)).patch quilt push -a; popd; fi
+	docker info $(LOG)
 	docker build --squash --no-cache \
 		--build-arg http_proxy=$(HTTP_PROXY) \
 		--build-arg https_proxy=$(HTTPS_PROXY) \
@@ -416,6 +417,7 @@ $(addprefix $(TARGET_PATH)/, $(SONIC_DOCKER_IMAGES)) : $(TARGET_PATH)/%.gz : .pl
 	$(eval export $(subst -,_,$(notdir $($*.gz_PATH)))_whls=$(shell printf "$(subst $(SPACE),\n,$(call expand,$($*.gz_PYTHON_WHEELS)))\n" | awk '!a[$$0]++'))
 	$(eval export $(subst -,_,$(notdir $($*.gz_PATH)))_dbgs=$(shell printf "$(subst $(SPACE),\n,$(call expand,$($*.gz_DBG_PACKAGES)))\n" | awk '!a[$$0]++'))
 	j2 $($*.gz_PATH)/Dockerfile.j2 > $($*.gz_PATH)/Dockerfile
+	docker info $(LOG)
 	docker build --squash --no-cache \
 		--build-arg http_proxy=$(HTTP_PROXY) \
 		--build-arg https_proxy=$(HTTPS_PROXY) \

sonic-slave/Dockerfile

@@ -298,4 +298,4 @@ RUN add-apt-repository \
            stable"
 RUN apt-get update
 RUN apt-get install -y docker-ce=17.03.2~ce-0~debian-jessie
-RUN echo "DOCKER_OPTS=\"--experimental\"" >> /etc/default/docker
+RUN echo "DOCKER_OPTS=\"--experimental --storage-driver=vfs\"" >> /etc/default/docker