HIVE-2817 [jira] Drop any table even without privilege

Summary:
HIVE-2817

You can drop any table if you use fully qualified name 'database.table' even you don't have any previlige.

hive> set hive.security.authorization.enabled=true;
hive> revoke all on default from user test_user;
hive> drop table abc;
hive> drop table abc;
Authorization failed:No privilege 'Drop' found for outputs { database:default, table:abc}. Use show grant to get more details.
hive> drop table default.abc;
OK
Time taken: 0.13 seconds

The table and the file in /usr/hive/warehouse or external file will be deleted. If you don't have hadoop access permission on /usr/hive/warehouse or external files, you will see a hadoop access error

12/02/23 15:35:35 ERROR hive.log: org.apache.hadoop.security.AccessControlException: org.apache.hadoop.security.AccessControlException: Permission denied: user=test_user, access=WRITE, inode="/user/myetl":myetl:etl:drwxr-xr-x
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)

Test Plan: EMPTY

Reviewers: JIRA

Differential Revision: https://reviews.facebook.net/D10563