Make legacy security optional for "org.wildfly.extension.batch.jberet"

The dependency needs to optional so provisioning a layer with batch does not automatically pull in legacy security.

This is not just about making the module dependency optional, this is about understanding why it is not optional and identifying the steps required to make it optional.

This needs to consider:

• Default Configuration
• User Defined Configuration

Both of these can have different consequences depending on of they are used for:

• Resource defined services
• DeploymentUnitProcessor processing