The tools are not properly handling a simple attribute addition to subsystem.jaxrs.

I have added an attribute to jaxrs/src/main/resources/subsystem-templates/jaxrs.xml.
The new definition is this,
<subsystem xmlns="urn:jboss:domain:jaxrs:2.0" statistics-enabled="${wildfly.jaxrs.statistics-enabled:${wildfly.statistics-enabled:false}}" />
The old definition was this
<subsystem xmlns="urn:jboss:domain:jaxrs:2.0"/>

I have made the following changes in 2 files galleon-pack files but
none of this is reflected in the generated standalone*.xml files.

• to galleon-pack/src/main/resources/feature_groups/basic-profile.xml I added
  <feature spec="subsystem.jaxrs">
  <param name="statistics-enabled" value="${wildfly.jaxrs.statistics-enabled:${wildfly.statistics-jaxrs:false}}"/>
  </feature>

• to galleon-pack/src/main/resources/layers/standalone/jaxrs/layer-spec.xml I added
  <feature spec="subsystem.jaxrs">
  <param name="statistics-enabled" value="${wildfly.jaxrs.statistics-enabled:${wildfly.statistics-jaxrs:false}}"/>
  </feature>

This change is required for https://issues.jboss.org/browse/WFLY-11943

Attached zip file contains the files I changed and tested with.