fix Travis CI and bugs

Author: 缘潘

src/main/java/com/qiniu/processing/OperationManager.java

@@ -165,21 +165,7 @@ public OperationStatus prefop(String persistentId) throws QiniuException {
     public <T> T prefop(String persistentId, Class<T> retClass) throws QiniuException {
         StringMap params = new StringMap().put("id", persistentId);
         byte[] data = StringUtils.utf8Bytes(params.formString());
-        String apiHost;
-
-        if (this.configuration.region != null) {
-            apiHost = this.configuration.region.getApiHost();
-            if (this.configuration.useHttpsDomains) {
-                apiHost = this.configuration.region.getApiHost();
-            }
-        } else {
-            apiHost = "http://api.qiniu.com";
-            if (this.configuration.useHttpsDomains) {
-                apiHost = "https://api.qiniu.com";
-            }
-        }
-
-        String url = String.format("%s/status/get/prefop", apiHost);
+        String url = String.format("%s/status/get/prefop", configuration.apiHost());
         Response response = this.client.post(url, data, null, Client.FormMime);
         return response.jsonToObject(retClass);
     }

src/main/java/com/qiniu/storage/BucketManager.java

@@ -546,6 +546,7 @@ public void prefetch(String bucket, String key) throws QiniuException {
      * @param bucket     空间名称
      * @param srcSiteUrl 镜像回源地址
      */
+    // TODO：准备干掉setImage、unsetImage，重写
     public Response setImage(String bucket, String srcSiteUrl) throws QiniuException {
         return setImage(bucket, srcSiteUrl, null);
     }
@@ -557,6 +558,7 @@ public Response setImage(String bucket, String srcSiteUrl) throws QiniuException
      * @param srcSiteUrl 镜像回源地址
      * @param host       镜像回源Host
      */
+    // TODO：准备干掉setImage、unsetImage，重写
     public Response setImage(String bucket, String srcSiteUrl, String host) throws QiniuException {
         String encodedSiteUrl = UrlSafeBase64.encodeToString(srcSiteUrl);
         String encodedHost = null;
@@ -575,6 +577,7 @@ public Response setImage(String bucket, String srcSiteUrl, String host) throws Q
      *
      * @param bucket 空间名称
      */
+    // TODO：准备干掉setImage、unsetImage，重写
     public Response unsetImage(String bucket) throws QiniuException {
         String path = String.format("/unimage/%s", bucket);
         return pubPost(path);

src/test/java/test/com/qiniu/processing/PfopTest.java

@@ -66,7 +66,7 @@ public void testPfop() {
     public void testPrefop() {
         try {
         	String jobid = "z0.5c81361a38b9f349c8bb5288";
-            Configuration cfg = new Configuration();
+            Configuration cfg = new Configuration(Region.autoRegion());
             OperationManager operationManager = new OperationManager(TestConfig.testAuth, cfg);
             OperationStatus status = operationManager.prefop(jobid);
             Assert.assertEquals(0, status.code);