Make Post Processor honor spring.cloud.kubernetes.enabled (spring-cloud#421)

Fixes: spring-cloud#420

Author: geoand

spring-cloud-kubernetes-core/src/main/java/org/springframework/cloud/kubernetes/profile/KubernetesProfileEnvironmentPostProcessor.java

@@ -42,6 +42,12 @@ public class KubernetesProfileEnvironmentPostProcessor
 	@Override
 	public void postProcessEnvironment(ConfigurableEnvironment environment,
 			SpringApplication application) {
+
+		final String enabledStr = environment.getProperty("spring.cloud.kubernetes.enabled", "false");
+		if ("true".equals(enabledStr.toLowerCase())) {
+			return;
+		}
+
 		final StandardPodUtils podUtils = new StandardPodUtils(
 				new DefaultKubernetesClient());
 		if (podUtils.isInsideKubernetes()) {