Add while construct 
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                 Key: AIRAVATA-287
                 URL: https://issues.apache.org/jira/browse/AIRAVATA-287
             Project: Airavata
          Issue Type: New Feature
          Components: XBaya
    Affects Versions: 0.4-INCUBATING
            Reporter: Chathura Herath
            Assignee: Raminderjeet Singh
            Priority: Minor


Add a do while component that will accept  a predicate input and a repeating 
input and shall rerun a particular service component until such time the 
predicate shall become false.

Var input= intialInput, predicate=true

while(predicate)
    invoke service with input

    input= service output
    predicate = service pedicate output
    


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