Deprecate and remove WhiteListRoundRobinPolicy, add a HostFilterPolicy

Description

We've decided that whitelist policies are something of an attractive nuisance – they're rarely the correct choice for a running cluster, but their presence implies their suitability. After some internal discussion, we've decided to deprecate whitelist policies and add HostFilterPolicy implimentations, after that in the Java driver.

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Reporter

Jim Witschey

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