@Override
	public void initialize(ConfigurableApplicationContext applicationContext) {
		final MapPropertySource propertySource = new MapPropertySource("test", ImmutableMap.<String, Object> of(
				"security.basic.enabled", String.valueOf(false)));
		applicationContext.getEnvironment().getPropertySources().addFirst(propertySource);
	}
Custom initializer for {@link SecurityControllerIntegrationTests}. Customizes
the {@link Environment} and sets {@code security.basic.enabled=false}.

@author Gunnar Hillert
spring-xd-dirt/src/test/java/org/springframework/xd/dirt/rest/security/SecurityControllerIntegrationTestsInitializer.java