Install iproute2 and iputils-ping in Dockerfile.aarch64

ping and ip command are need in integration-cli test, but
they are missing in ubuntu:wily.

Signed-off-by: Lei Jitang <leijitang@huawei.com>

Dockerfile.aarch64

@@ -47,6 +47,8 @@ RUN apt-get update && apt-get install -y \
 	python-pip \
 	python-websocket \
 	gccgo \
+	iproute2 \
+	iputils-ping \
 	--no-install-recommends
 
 # Install armhf loader to use armv6 binaries on armv8