Add tags functionality/filter to aws_elb/aws_elbs

[mwiczynski-cartera]

Would like to be able to filter elbs using tags.

Detailed Description

This is example of what I would like to see working:

  aws_elbs.where(tags: {"Environment" => "Dev"}).load_balancer_names.each do |name|
    describe aws_elb(name) do
      it { should be_cross_zone_load_balancing_enabled }
    end
  end

Context

I want to be able test find/test elbs based on tags. We do not set names for elbs, let AWS choose/set the name so cannot filter on elb name/dnsname.