message: build image: Install openssl in the centos build image.
diff: @@ -8,7 +8,7 @@ curl -L -o /etc/yum.repos.d/alonid-llvm-5.0.0-epel-7.repo \
  https://copr.fedorainfracloud.org/coprs/alonid/llvm-5.0.0/repo/epel-7/alonid-llvm-5.0.0-epel-7.repo
  # dependencies for bazel and build_recipes
  -yum install -y java-1.8.0-openjdk-devel unzip which \
  +yum install -y java-1.8.0-openjdk-devel unzip which openssl rpm-build \
  cmake3 devtoolset-4-gcc-c++ git golang libtool make patch rsync wget \
  clang-5.0.0 devtoolset-4-libatomic-devel llvm-5.0.0 python-virtualenv
  yum clean all
  