Replacing deprecated class

Author: sarveshkaushal

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

@@ -14,9 +14,9 @@
 
 import static io.kubernetes.client.util.Config.ENV_SERVICE_HOST;
 import static io.kubernetes.client.util.Config.ENV_SERVICE_PORT;
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.core.Is.is;
 import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertThat;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.verify;
 

util/src/test/java/io/kubernetes/client/util/credentials/AccessTokenAuthenticationTest.java

@@ -1,8 +1,8 @@
 package io.kubernetes.client.util.credentials;
 
 import static io.kubernetes.client.util.TestUtils.getApiKeyAuthFromClient;
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.core.Is.is;
-import static org.junit.Assert.*;
 
 import io.kubernetes.client.openapi.ApiClient;
 import org.junit.Test;

util/src/test/java/io/kubernetes/client/util/credentials/UsernamePasswordAuthenticationTest.java

@@ -1,8 +1,8 @@
 package io.kubernetes.client.util.credentials;
 
 import static io.kubernetes.client.util.TestUtils.getApiKeyAuthFromClient;
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.core.Is.is;
-import static org.junit.Assert.*;
 
 import com.google.common.base.Charsets;
 import io.kubernetes.client.openapi.ApiClient;