support cluster based on consistent hash#18

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yanxurui wants to merge 6 commits intoopenresty:masterfrom

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Commits on May 22, 2017

tests: set with exptime first then get
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Commits on Nov 28, 2017

feature: support cluster by consistent hashing
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tests: hashmemcacahe
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doc: support memcache cluster
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Merge branch 'master' of https://github.com/openresty/lua-resty-memcached
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Merge branch 'chash'
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