Add missing displayName and domains properties to response of Tenants_List call

[cormacpayne]

Description

Partial fix for issue #6468 -- the model object returned from the Tenants_List call in the subscriptions.json spec for ARM is missing a few properties (as outlined in the linked issue), and this change is adding two missing properties (displayName and domains) to this object in the latest stable API version for this spec.

CC: @Tiano2017 @ravbhatnagar -- would you mind taking a look at this change?

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[cormacpayne]

@zikalino @Tiano2017 @ravbhatnagar gentle ping 😀

[zikalino]

@cormacpayne looks good in general. just doing a few checks :-)

[zikalino]

@cormacpayne I have actually tried GET /tenants using api_version 2018-06-01, and I didn't get these properties, so I think I would like to verify what's the reason.

        "response": [
            {
                "id": "/tenants/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
                "tenantId": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
            }
        ],
        "url": "/tenants",```

@Tiano2017 @ravbhatnagar could you check that?

[Tiano2017]

@zikalino I did it just now.. and could see "domains" in the response.

[zikalino]

@stankovski is it ok to merge?

[cormacpayne]

@stankovski any update?

[chiragg4u]

Thanks Cormac for these changes. :)

[cormacpayne]

@zikalino @stankovski is this OK to merge?