Marshal / Unmarshal EIP - Should not support outputs in XML DSL
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                 Key: CAMEL-4111
                 URL: https://issues.apache.org/jira/browse/CAMEL-4111
             Project: Camel
          Issue Type: Improvement
          Components: camel-blueprint, camel-core, camel-spring
            Reporter: Claus Ibsen
            Assignee: Claus Ibsen
            Priority: Minor
             Fix For: 2.8.0


When using <marshal> or <unmarshal> in XML DSL, the model allows them to have 
outputs, so you can in theory do:
{code:xml}
        <route>
            <from uri="direct:unmarshal"/>
            <unmarshal>
                <string charset="UTF-8"/>
                <to uri="mock:unmarshal"/>
            </unmarshal>
        </route>
{code}

This is unusual as people should do as follows:

{code:xml}
        <route>
            <from uri="direct:unmarshal"/>
            <unmarshal>
                <string charset="UTF-8"/>
            </unmarshal>
            <to uri="mock:unmarshal"/>
        </route>
{code}

We should fix this so they dont accept outputs. This also make code completion 
much easier, as if you press ctrl + space inside the <unmarshal> tag you only 
get the list of possible data formats to choose among.

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