* add siteID to cache Get
* indirect option setters
* add mongo cache with tests, add Key and Flusher
* lint: minor warns
* workaround for cache parallel test
* repeater in mongo cache
* missing repeater vendor
* fix nop cache
* add cache mongo benchmark
* wired mongo cache, single opts group for mongo
* disable goconst
* stop cache repeated on not found error
* use local mongo for tests in travis
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Anton KosourovandUmputun