* add keyStore and switch all secret usage to this store
- implement static ks
- add shared secret
* lint: shadow in jwt and missing comment
* rename static key group to shared and use top-level shared secret
* move siteID extraction (from token) to internal func
* lint: merge var and assign for key test
* 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
Umputun
Anton KosourovandUmputun