Remove setup for google-java-format 1.6

Change-Id: Ieae22d18d2107a708a621f7fe0c5883f95010eef
diff --git a/jenkins-docker/slave-bazel/Dockerfile b/jenkins-docker/slave-bazel/Dockerfile
index cba404f..c888e15 100644
--- a/jenkins-docker/slave-bazel/Dockerfile
+++ b/jenkins-docker/slave-bazel/Dockerfile
@@ -4,9 +4,8 @@
 # Set-up google-java-format utility to ~/format/google-java-format
 USER jenkins
 RUN bash -c '. /usr/bin/set-java.sh 8 && \
-    cd /tmp &&  git clone -b stable-2.15 --recursive https://gerrit.googlesource.com/gerrit && \
+    cd /tmp && git clone -b stable-2.15 --recursive https://gerrit.googlesource.com/gerrit && \
     cd /tmp/gerrit && \
-    ./tools/setup_gjf.sh 1.6 && \
     ./tools/setup_gjf.sh 1.7 && \
     ( bazel build //... || true ) && \
     git checkout -f stable-2.16 && git submodule update --init && ( bazel build //... || true ) && \