Fix kubernetes rule name hashing

[greenboxal]

This fixes a ID generation issue when a single ingress contains two hostnames that would collide given the previous routeID function.

The problem was caused because of the sanitization rule, that replaced any non-word with an underscore. Given my-api.prd.company.com and my-api-prd.company.com, they would be sanitized to the same name, my_api_prd_company_com.

Somewhere down the code, one would effectively replace the other rule, allowing only one of the domains to be actually registered. (probably by putting the routes on a map using eskip.Route.Id as key)

My solution was to include the index of the ingress host in the name. Anything else that could make the ID unique would work as well (hashing, etc)

[szuecs]

I think this will fix the routeID and in the kubernetes dataclient we also mask . with [.] so it should be fine in general. So my mentioned comment here #853 (comment) does not apply.

[szuecs]

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[szuecs]

@aryszka please review, thanks

[aryszka]

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[aryszka]

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[szuecs]

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