Bump up docker image build to bazel version 0.17.1

Change-Id: I29b749aa46b31d87fcd879e058a92b4e5733a64d
diff --git a/Dockerfile b/Dockerfile
index 710f4f0..c83b2fb 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -17,7 +17,7 @@
 # build problems
 WORKDIR /src/onos
 RUN apt-get update && apt-get install -y zip python git bzip2 build-essential && \
-        curl -L -o bazel.sh https://github.com/bazelbuild/bazel/releases/download/0.15.2/bazel-0.15.2-installer-linux-x86_64.sh && \
+        curl -L -o bazel.sh https://github.com/bazelbuild/bazel/releases/download/0.17.1/bazel-0.17.1-installer-linux-x86_64.sh && \
         chmod +x bazel.sh && \
         ./bazel.sh --user && \
         export ONOS_ROOT=/src/onos && \