Switch to using FNV hash. Crc doesn't work with different seeds.

Change-Id: Id74d7e84bd82d5d882d07195b6292c1a1d352005
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4302
Reviewed-by: Skye Wanderman-Milne <skye@cloudera.com>
Tested-by: jenkins