add udaf max_n, min_n to contrib
--------------------------------
Key: HIVE-894
URL: https://issues.apache.org/jira/browse/HIVE-894
Project: Hadoop Hive
Issue Type: New Feature
Reporter: Zheng Shao
These 2 UDAFs should return the max n numbers, min n numbers in order.
{code}
SELECT max_n(userid, 3) FROM src;
[999,997,996]
SELECT max_n(userid, 3)[1] FROM src;
997
SELECT min_n(userid, 3) FROM src;
[0, 3, 8]
SELECT min_n(userid, 3)[2] FROM src;
8
{code}
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