Rename howl references to hcatalog / hcat -----------------------------------------
Key: HIVE-2168
URL: https://issues.apache.org/jira/browse/HIVE-2168
Project: Hive
Issue Type: Bug
Reporter: Mac Yang
Priority: Minor
Howl has been renamed to HCatalog, we should clean up the howl references.
This is the hive counter part of hcatalog-15.
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