add in bazel installation to release build verification job

Change-Id: I9d4bd97bcee9edb0770169a6d413c53d3f98ea24
diff --git a/jjb/onos/onos-release-build.sh b/jjb/onos/onos-release-build.sh
index 8d488b8..78bdf85 100644
--- a/jjb/onos/onos-release-build.sh
+++ b/jjb/onos/onos-release-build.sh
@@ -7,6 +7,11 @@
 ONOS_ROOT=`pwd`
 . tools/build/envDefaults
 
+curl -L -o bazel.sh https://github.com/bazelbuild/bazel/releases/download/0.15.2/bazel-0.15.2-installer-linux-x86_64.sh
+chmod +x bazel.sh 
+./bazel.sh --user
+PATH=$PATH:/home/jenkins/bin
+
 # import GPG key
 gpg --import jenkins.key