Add missing deserialization tests about go-marathon HOT 3 OPEN

Unsure if this is the best place or if you want me to open a new issue for this. When I unmarshal:

"docker": {
    "image": "python:3",
    "network": "BRIDGE",
    "portMappings": [
        {
            "containerPort": 8080,
            "hostPort": 0
        }
    ]
}

then I get a:

FATA[0000] Failed to create application null. Error: Marathon API error: Object is not valid (attribute '': )` 

I need to add: "servicePort": 0, "protocol": "tcp" there to make it work. This shouldn't be necessary since the latter two attributes are not required.

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@mhausenblas In which context does the error show up exactly? You say unmarshal but the error message seems to indicate that this is happening when you create an application (i.e., send a POST to the Marathon API). If so, how did you initialize your Application instance?

Also, what version of Marathon are you testing against?

I think we should address this problem in a new issue. While you could be hitting a case that proper test coverage (the goal of this ticket) may have prevented, the immediate fix should probably be handled separately (and more quickly).
Could you please create another ticket? Thanks!

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Thanks @timoreimann and done: #144

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