fs_tool should allow passing hex block ids
fs_tool should allow passing hex block ids

Change-Id: I9101ed496773ce9aee9453ee6c2f221d0d1832e4
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/8278
Tested-by: jenkins
Reviewed-by: David Alves <33ea948168c114d220e0372a903be6ee60f6396e@cloudera.com>

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