Allow cm:property-placeholder substitution within bean attributes
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                 Key: ARIES-462
                 URL: https://issues.apache.org/jira/browse/ARIES-462
             Project: Aries
          Issue Type: Improvement
          Components: Blueprint
    Affects Versions: 0.3
            Reporter: Craig Muchinsky
            Priority: Minor


To allow a user to swap out a bean implementation via configuration, it would 
be nice if cm:property-placeholder substitution worked within bean attributes 
(specifically 'class' but I suppose a case could be made for other fields as 
well). For example:

<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"; 
xmlns:cm="http://aries.apache.org/blueprint/xmlns/blueprint-cm/v1.0.0";>
  <cm:property-placeholder persistent-id="foo">
    <cm:default-properties>
      <cm:property name="foo.classname" value="com.foo.DefaultFoo"/>
    </cm:default-properties>
  </cm:property-placeholder>

  <bean id="foo" class="${foo.classname}"/>
</blueprint>

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