Make AssignmentManager standalone testable by having its constructor take 
Interfaces rather than a CatalogTracker and a ServerManager
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                 Key: HBASE-3896
                 URL: https://issues.apache.org/jira/browse/HBASE-3896
             Project: HBase
          Issue Type: Task
            Reporter: stack


If we could stand up an instance of AssignmentManager, a core fat class that 
has a bunch of critical logic managing state transitions, then it'd be easier 
writing unit tests around its logic.  Currently its hard because it takes a 
ServerManager and a CatalogTracker, but a little bit of work could turn these 
into Interfaces.  SM looks easy to do.  Changing CT into an Interface instead 
might ripple a little through the code base but it'd probably be well worth it.

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