Verify license using Apache Rat
https://issues.apache.org/jira/browse/PHOENIX-45
Change DEFAULT_MAX_MEMORY_PERC to 20 (old value 50)
Rename package from org.apache.hadoop.hbase.index.* to org.apache.phoenix.index.* to fix classloader issue causing mutable index performance regression - https://issues.apache.org/jira/browse/PHOENIX-38
PHOENIX-46 Use Apache Rat for release compliance checking
Merged upstream changes