prevent integer values overflowing our index datatypes
prevent integer values overflowing our index datatypes

the cassandra index uses 'int' type which is a 32bit signed integer.
If we allow extremely high interval and timestamp values then
we will get errors trying to update index in cassandra, which will
keep retrying and blocking metrictank.

replay/metrictank,replay/metrictank,raintank/raintank-metric,raintank/metrictank,raintank/raintank-metric,replay/metrictank,raintank/metrictank,raintank/metrictank,replay/metrictank,raintank/metrictank,raintank/raintank-metric