Use travis Job id in upload suffix to enable parallel testing.

Author: nitzanj

cloudinary-test-common/src/main/java/com/cloudinary/test/MockableTest.java

@@ -3,6 +3,7 @@
 import com.cloudinary.Api;
 import com.cloudinary.Cloudinary;
 import com.cloudinary.utils.ObjectUtils;
+import com.cloudinary.utils.StringUtils;
 import sun.reflect.generics.reflectiveObjects.NotImplementedException;
 
 import java.io.IOException;
@@ -13,7 +14,7 @@ public class MockableTest {
 
     public static final String SRC_TEST_IMAGE = "../cloudinary-test-common/src/main/resources/old_logo.png";
     public static final String REMOTE_TEST_IMAGE = "http://cloudinary.com/images/old_logo.png";
-    protected static final String SUFFIX = String.valueOf(new Random().nextInt(99999));
+    protected static String SUFFIX = StringUtils.isNotBlank(System.getenv("TRAVIS_JOB_ID")) ? System.getenv("TRAVIS_JOB_ID") : String.valueOf(new Random().nextInt(99999));
     protected static final String SDK_TEST_TAG = "cloudinary_java_test_" + SUFFIX;
     protected static final String uniqueTag = SDK_TEST_TAG + (new java.util.Date().getTime());
     protected Cloudinary cloudinary;