Added invoke_stage1 and invoke_stage2 methods to AbstractHandler
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                 Key: AXIS2-4881
                 URL: https://issues.apache.org/jira/browse/AXIS2-4881
             Project: Axis2
          Issue Type: Bug
            Reporter: Rich Scheuerle
            Assignee: Rich Scheuerle


Background:
The AbstractHandler class exposes an invoke() method that Handlers override to 
provide the specific invoke code.

Problem:
Many Handlers actually have 2 stages of logic.  The first stage simply does 
some quick processing to determine if the handler should be called.  The second 
stage does the actual work.
Because there is only one invoke method, these separate stages of processing 
get lumped together.

Solution:
Provide an alternative (optional) invoke semantic.
A Handler can choose to override the new invoke_stage1 and invoke_stage2 
methods.
All current Handlers will continue to work.  The existing invoke() method is 
retained.



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