DexIdP Session支持

https://github.com/juliantaylor/dex/commit/b3fc3e6c2295c0af166803bdde0977ed170d1d40

https://github.com/dexidp/dex/issues/32

https://github.com/dexidp/dex/pull/1574/files#diff-b877a4fe9a6210f40c1a5fbcf4c6dd366856b31ec0661975dcf60915cf3985d1

https://github.com/dexidp/dex/issues/963

https://github.com/dexidp/dex/issues/1697

https://github.com/dexidp/dex/issues/1677

https://github.com/mesosphere/traefik-forward-auth/pull/33

Logout 支持：

https://github.com/kyma-incubator/compass-console/pull/53