Refactor out routing system#655

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aschmahmann wants to merge 7 commits intomasterfrom

feat/refactor-routing

Commits on Jan 4, 2021

refactor: remove extraneous quorum check in dht.GetValue
aschmahmann
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refactor: move quorum default value to be defined with quorum option
aschmahmann
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refactor: move quorum option to into a separate routing package
aschmahmann
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refactor: switch to non-deprecated version of Quorum option in dual dht test
aschmahmann
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feat: add extended routing functions that take functional options and return the closest peers used in the query
aschmahmann
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feat: add support for controlling the seed peers used in queries
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feat: rework routing to be more configurable
aschmahmann
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