De-duplicate list of open app ports

This should fix rolling deployments on Windows

[#172811099](https://www.pivotaltracker.com/story/show/172811099)

Authored-by: Chris Selzo <cselzo@pivotal.io>

Author: selzoc

lib/cloud_controller/diego/protocol/container_network_info.rb

@@ -20,7 +20,7 @@ def to_h
               'app_id' => app.guid,
               'space_id' => app.space.guid,
               'org_id' => app.organization.guid,
-              'ports' => app.processes.map(&:open_ports).flatten.sort.join(','),
+              'ports' => app.processes.map(&:open_ports).flatten.sort.uniq.join(','),
               'container_workload' => container_workload,
             },
           }

spec/unit/lib/cloud_controller/diego/protocol/container_network_info_spec.rb

@@ -6,6 +6,7 @@ class Protocol
       RSpec.describe ContainerNetworkInfo do
         let(:app) { AppModel.make }
         let!(:web_process) { ProcessModel.make(app: app, type: 'web') }
+        let!(:deploying_web_process) { ProcessModel.make(app: app, type: 'web') }
         let!(:other_process) { ProcessModel.make(app: app, ports: [8765], type: 'meow') }
         let!(:no_exposed_port_process) { ProcessModel.make(app: app, type: 'woof') }
         let!(:docker_process) { ProcessModelFactory.make(app: app, type: 'docker', ports: [1111, 2222]) }