Upgrade buildifier to 2.0.0 in docker image

Also update the build command so that the version is properly set
per the comment from Vladimir Moskva on [1].

[1] https://github.com/bazelbuild/buildtools/issues/782#issuecomment-596080487

Change-Id: I21c6e79206dd10196682f47bd93e91c148df2e45
diff --git a/jenkins-docker/slave-bazel-nocache/Dockerfile b/jenkins-docker/slave-bazel-nocache/Dockerfile
index 74db4d9..1ccd1f9 100644
--- a/jenkins-docker/slave-bazel-nocache/Dockerfile
+++ b/jenkins-docker/slave-bazel-nocache/Dockerfile
@@ -17,7 +17,7 @@
     git clone https://github.com/bazelbuild/buildtools.git && \
     cd buildtools && \
     git checkout ${BUILDIFIER_VER} && \
-    bazel build --workspace_status_command=`pwd`/status.py //buildifier && \
+    bazel build --config=release //buildifier && \
     cp bazel-bin/buildifier/linux_amd64_stripped/buildifier /usr/bin && \
     rm -rf /tmp/buildtools && \
     buildifier --version'
diff --git a/jenkins-docker/slave-bazel-nocache/Makefile b/jenkins-docker/slave-bazel-nocache/Makefile
index a88a5cb..e4a3c4e 100644
--- a/jenkins-docker/slave-bazel-nocache/Makefile
+++ b/jenkins-docker/slave-bazel-nocache/Makefile
@@ -1,7 +1,7 @@
 NO_CACHE=false
 IMAGE=gerritforge/gerrit-ci-slave-bazel:debian-stretch-nocache
 BAZEL_VER=2.2.0
-BUILDIFIER_VER=1.0.0
+BUILDIFIER_VER=2.0.0
 BAZELISK_VER=1.1.0
 NODE_VER=10
 WCT_VER=6.8.0