message: updated bazel README doc to specify external dependencies to be install to build envoy using bazel
diff: @@ -25,8 +25,17 @@ testing purposes. The specific versions of the Envoy dependencies used in this b
  up-to-date with the latest security patches.
  1. [Install Bazel](https://bazel.build/versions/master/docs/install.html) in your environment.
  -2. `bazel fetch //source/...` to fetch and build all external dependencies. This may take some time.
  -2. `bazel build //source/exe:envoy-static` from the Envoy source directory.
  +2. Install external dependencies libtoolize, cmake, and realpath libraries separately.
  +```
  +On Ubuntu Machine, run the following commands:
  + apt-get install libtoolize
  + apt-get install cmake
  + apt-get install realpath
  +```
  +3. Install Golang on your machine. This is required as part of building [BoringSSL](https://boringssl.googlesource.com/boringssl/+/HEAD/BUILDING.md)
  +and also for [Buildifer](https://github.com/bazelbuild/buildtools) which is used for formatting bazel BUILD files.
  +4. `bazel fetch //source/...` to fetch and build all external dependencies. This may take some time.
  +5. `bazel build //source/exe:envoy-static` from the Envoy source directory.
  ## Building Bazel with the CI Docker image
  