Change RPC layer to support SASL/token based mutual authentication
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                 Key: HADOOP-6419
                 URL: https://issues.apache.org/jira/browse/HADOOP-6419
             Project: Hadoop Common
          Issue Type: New Feature
          Components: security
            Reporter: Kan Zhang
            Assignee: Kan Zhang


The authentication mechanism to use will be SASL DIGEST-MD5 (see RFC-2222 and 
RFC-2831). Since J2SE 5, Sun provides a SASL implementation by default. Both 
our delegation token and job token can be used as credentials for SASL 
DIGEST-MD5 authentication.

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