Add spec to check OSS compliance of erlang blob
user
```ruby
require 'spec_helper'
require 'rubygems/package'
require 'zlib'
require 'yaml'
require 'httparty'

describe 'OSS Compliance' do

  describe 'Erlang blob compliance' do

    blob_path = ""

    before :all do
      blob_path = fetch_blob("erlang\/otp")
    end

    it 'should not contain proper/proper_common.hrl' do
      expect(blob_contains(blob_path, "proper\/proper_common.hrl")).to be(false)
    end

    it 'should not contain ewgi/ewgi.hrl' do
      expect(blob_contains(blob_path, "ewgi\/ewgi.hrl")).to be(false)
    end

    it 'should not contain ewgi2/ewgi.hrl' do
      expect(blob_contains(blob_path, "ewgi2\/ewgi.hrl")).to be(false)
    end
  end
end

def download_from_blob_bucket(blob_object_id, local_destination)
  bucket_address ="https://s3.amazonaws.com/rabbitmq-bosh-release-blobs"
  File.open("#{local_destination}", "wb") do |f|
      f.write HTTParty.get("#{bucket_address}/#{blob_object_id}").parsed_response
  end
end

def fetch_blob(blob_prefix)
  blobs = YAML.load_file('config/blobs.yml')
  blob_properties = blobs.detect{ |key,val| /#{blob_prefix}/.match(key) }[1]

  local_destination = "/tmp/erlang_oss_test_run.tgz"
  download_from_blob_bucket(blob_properties["object_id"], local_destination)

  return local_destination
end

def blob_contains(blob_path, filename)
  tar_extract = Gem::Package::TarReader.new(Zlib::GzipReader.open(blob_path))
  tar_extract.rewind # The extract has to be rewinded after every iteration
  tar_extract.count { |entry| /#{filename}/.match(entry.full_name) } != 0
end
```
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