private void mergeStackWithExtension(
		  ExtensionModule extension, Map<String, StackModule> allStacks, Map<String, ServiceModule> commonServices, Map<String, ExtensionModule> extensions)
      throws AmbariException {

  }
Merge the stack with one of its linked extensions.

@param allStacks      all stacks in stack definition
@param commonServices all common services specified in the stack definition

@throws AmbariException if an exception occurs merging with the parent
ambari-server/src/main/java/org/apache/ambari/server/stack/StackModule.java