register multiple ports with the same service name

[kaiserpelagic]

Filling this issue by request of @dadgar in gitter chat

Nomad version

0.4.1

Operating system and Environment details

nomad in alpine docker running on debian

Issue

Can't declare multiple services with the same name. Use case is to expose multiple ports for the same named service.

gitter discussion starts:
https://gitter.im/hashicorp-nomad/Lobby?at=5818e596cde075e6560b79b5

[github-actions]

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