controller should not create duplicates for adaptors with offsets
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                 Key: CHUKWA-330
                 URL: https://issues.apache.org/jira/browse/CHUKWA-330
             Project: Hadoop Chukwa
          Issue Type: Bug
          Components: input tools
            Reporter: Ari Rabkin
            Assignee: Ari Rabkin
            Priority: Blocker


The offset-of-first-byte param to FileTailingAdaptor is hashed into the default 
adaptor name.  This changes the semantics of adaptor uniqueness, and broke 
metrics and the log4jappender.

Proposed fix:
  Add a new "addByName()" method to ChukwaAgentController that lets callers 
specify names.  
  Use this new method whenever finer control of adaptor uniqueness is needed.


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