Fix ClusterManager too optimistic timeouts.

Also, make sure the PaginatorTests pass properly with a larger timeout
since persisting can take longer than the default timeout.

Change-Id: Id11eceea654b3b4f1267dc61627d3f477eda445e
Reviewed-on: http://review.couchbase.org/31569
Tested-by: Michael Nitschinger <michael.nitschinger@couchbase.com>
Reviewed-by: Matt Ingenthron <matt@couchbase.com>