Desthost: Add support for wildcard host entries

[alvaroaleman]

This change adds support for wildcard host entries to the desthost
backend manager. Useful if all domains below a certain domain should use
a specific backend.

/assign @cheftako @andrewsykim

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[andrewsykim]

Just a FYI, currently holding off on features until we sort out #346. This is so we can sustainably back-port bug fixes only into the current release without introducing more features.

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@k8s-triage-robot: Closed this PR.

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