Added support for KUBECONFIG environment variable with multiple paths.

Use first kubeconfig file.

Author: roldevg

util/src/main/java/io/kubernetes/client/util/ClientBuilder.java

@@ -130,7 +130,7 @@ private String parseKubeConfigPath(String kubeConfigEnv) {
       final String[] filePaths = kubeConfigEnv.split(File.pathSeparator);
       final String kubeConfigPath = filePaths[0];
       if (filePaths.length > 1) {
-        log.info(
+        log.debug(
             "Found multiple kubeconfigs files, $KUBECONFIG: " + kubeConfigEnv + " using first: {}",
             kubeConfigPath);
       }

util/src/test/java/io/kubernetes/client/util/ClientBuilderTest.java

@@ -79,7 +79,7 @@ public void testDefaultClientReadsKubeConfig() throws Exception {
 
   @Test
   public void testDefaultClientReadsKubeConfigMultiple() throws Exception {
-    final String kubeConfigEnv = KUBECONFIG_FILE_PATH + File.pathSeparator + KUBECONFIG_FILE_PATH;
+    final String kubeConfigEnv = KUBECONFIG_FILE_PATH + File.pathSeparator + "/non-existent";
     environmentVariables.set("KUBECONFIG", kubeConfigEnv);
     final ApiClient client = ClientBuilder.defaultClient();
     assertEquals("http://kubeconfig.dir.com", client.getBasePath());