Session timeout longer than 30 days does not work.

[drathier]

Since couchbase treats TTL's shorter than 30 days as relative time, and longer than 30 days as time since unix epoch, couchbase deletes the session immediately if a time longer than 30 days is set. There is no documentation, and no code to handle this case.

[srinathgs]

@drathier You can add more validation or change MaxAge to time since epoch if MaxAge is > 30 days here. Can you fix this and raise a pr?