private String makeKeyFor(ModuleDefinition definition) {
		return definition.getType() + "|" + definition.getName();
	}
A {@link ModuleRegistry} that delegates to several ModuleRegistries, in order.

@author Eric Bottard
@author Glenn Renfro
@author David Turanski
spring-xd-dirt/src/main/java/org/springframework/xd/dirt/module/DelegatingModuleRegistry.java