Fix for batch mode not being able to replace required properties

[max-norris]

https://issues.apache.org/jira/browse/ARCHETYPE-509

If I specify a required property and then use that in another required property, as follows:

    <requiredProperties>
        <requiredProperty key="groupName">
        </requiredProperty>
        <requiredProperty key="serviceName">
        </requiredProperty>
        <requiredProperty key="groupId">
            <defaultValue>com.example.${groupName}</defaultValue>
        </requiredProperty>
        <requiredProperty key="package">
            <defaultValue>com.example.${groupName}</defaultValue>
        </requiredProperty>
        <requiredProperty key="artifactId">
            <defaultValue>${serviceName}</defaultValue>
        </requiredProperty>
        <requiredProperty key="version">
            <defaultValue>1.0.0-SNAPSHOT</defaultValue>
        </requiredProperty>
    </requiredProperties>

When I run an archetype generate with those properties specified:

mvn archetype:generate -B -DarchetypeGroupId=com.example -DarchetypeArtifactId=example-archetype -DgroupName=MyGroup -DserviceName=MyService

I get the following output:

[INFO] Parent element not overwritten in /private/tmp/${serviceName}/${serviceName}-app/pom.xml
[INFO] Parent element not overwritten in /private/tmp/${serviceName}/${serviceName}-proxy/pom.xml
[INFO] Parent element not overwritten in /private/tmp/${serviceName}/${serviceName}-dto/pom.xml
[INFO] Parent element not overwritten in /private/tmp/${serviceName}/${serviceName}-integration-tests/pom.xml
[INFO] Parent element not overwritten in /private/tmp/${serviceName}/${serviceName}-codegen/pom.xml
[INFO] project created from Archetype in dir: /private/tmp/${serviceName}

[rfscholte]

Fixed in 9857d34

[jira-importer]

Resolve #796

[jira-importer]

Resolve #796