Allow Cache expiry to be set to a fixed date. [DATAREDIS-772]

**[Christoph Strobl](https://jira.spring.io/secure/ViewProfile.jspa?name=cstrobl)** opened **[DATAREDIS-772](https://jira.spring.io/browse/DATAREDIS-772?redirect=false)** and commented


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**Reference URL:** https://stackoverflow.com/questions/48754143/rediscachemanager-set-expires-certain-time
