proxy to call LDAP for IP lookup and get user ID and directories, validate 
requested URL
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                 Key: HADOOP-5851
                 URL: https://issues.apache.org/jira/browse/HADOOP-5851
             Project: Hadoop Core
          Issue Type: New Feature
          Components: contrib/hdfsproxy
            Reporter: zhiyong zhang
            Assignee: zhiyong zhang
            Priority: Critical


It is easy to manage user accounts using LDAP. by adding support for LDAP, 
proxy can do IP authorization in a headless fashion. 

when a user send a request, proxy extract IP address and request PathInfo from 
the request. then it searches the LDAP server to get the allowed HDFS root 
paths given the IP address. Proxy will match the user request PathInfo with the 
allowed HDFS root path, return 403 if it could not find a match. 

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