Update LICENSE.txt and NOTICE.txt
---------------------------------
Key: CHUKWA-628
URL: https://issues.apache.org/jira/browse/CHUKWA-628
Project: Chukwa
Issue Type: Bug
Components: documentation
Affects Versions: 0.5.0
Reporter: Eric Yang
Assignee: Eric Yang
Priority: Minor
Fix For: 0.5.0
Minor polish to license files, request by IPMC. LICENSE.txt should have a list
of direct dependent licenses. NOTICE.txt should list out junit.
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