The firewall rule created on the differents edges to allow access
to the metadata service, should be restricted to the specific
supported protocols (tcp 80, 443, 8775), and not open to all protocols
The list of allowed ports can be extended using the nsx.ini parameter
'metadata_service_allowed_ports'
Change-Id: If2f0f30937eb3b7489a36feff1635de4822710bb