[SPARK-7403] [WEBUI] Link URL in objects on Timeline View is wrong in case of running on YARN

When we use Spark on YARN and have AllJobPage via ResourceManager's proxy, the link URL in objects which represent each job on timeline view is wrong.

In timeline-view.js, the link is generated as follows.
```
window.location.href = "job/?id=" + getJobId(this);
```

This assumes the URL displayed on the web browser ends with "jobs/" but when we access AllJobPage via the proxy, the url displayed does not end with "jobs/"

The proxy doesn't return status code 301 or 302 so the url displayed still indicates the base url, not "/jobs" even though displaying AllJobPages.

![2015-05-07 3 34 37](https://cloud.githubusercontent.com/assets/4736016/7501079/a8507ad6-f46c-11e4-9bed-62abea170f4c.png)

Author: Kousuke Saruta <sarutak@oss.nttdata.co.jp>

Closes #5947 from sarutak/fix-link-in-timeline and squashes the following commits:

aaf40e1 [Kousuke Saruta] Added Copyright for vis.js
01bee7b [Kousuke Saruta] Fixed timeline-view.js in order to get correct href

LICENSE

@@ -836,6 +836,22 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 
+========================================================================
+For vis.js (core/src/main/resources/org/apache/spark/ui/static/vis.min.js):
+========================================================================
+Copyright (C) 2010-2015 Almende B.V.
+
+Vis.js is dual licensed under both
+
+  * The Apache 2.0 License
+    http://www.apache.org/licenses/LICENSE-2.0
+
+and
+
+  * The MIT License
+    http://opensource.org/licenses/MIT
+
+Vis.js may be distributed under either license.
 
 ========================================================================
 BSD-style licenses

core/src/main/resources/org/apache/spark/ui/static/timeline-view.css

@@ -19,7 +19,8 @@ div#application-timeline, div#job-timeline {
   margin-bottom: 30px;
 }
 
-#application-timeline div.legend-area {
+#application-timeline div.legend-area,
+#job-timeline div.legend-area {
   margin-top: 5px;
 }
 

core/src/main/resources/org/apache/spark/ui/static/timeline-view.js

@@ -39,23 +39,24 @@ function drawApplicationTimeline(groupArray, eventObjArray, startTime) {
 
   function setupJobEventAction() {
     $(".item.range.job.application-timeline-object").each(function() {
-      var getJobId = function(baseElem) {
+      var getSelectorForJobEntry = function(baseElem) {
         var jobIdText = $($(baseElem).find(".application-timeline-content")[0]).text();
         var jobId = jobIdText.match("\\(Job (\\d+)\\)")[1];
-       return jobId;
+       return "#job-" + jobId;
       };
 
       $(this).click(function() {
-        window.location.href = "job/?id=" + getJobId(this);
+        var jobPagePath = $(getSelectorForJobEntry(this)).find("a").attr("href")
+          window.location.href = jobPagePath
       });
 
       $(this).hover(
         function() {
-          $("#job-" + getJobId(this)).addClass("corresponding-item-hover");
+          $(getSelectorForJobEntry(this)).addClass("corresponding-item-hover");
           $($(this).find("div.application-timeline-content")[0]).tooltip("show");
         },
         function() {
-          $("#job-" + getJobId(this)).removeClass("corresponding-item-hover");
+          $(getSelectorForJobEntry(this)).removeClass("corresponding-item-hover");
           $($(this).find("div.application-timeline-content")[0]).tooltip("hide");
         }
       );
@@ -97,32 +98,24 @@ function drawJobTimeline(groupArray, eventObjArray, startTime) {
 
   function setupStageEventAction() {
     $(".item.range.stage.job-timeline-object").each(function() {
-      var getStageIdAndAttempt = function(baseElem) {
+      var getSelectorForStageEntry = function(baseElem) {
         var stageIdText = $($(baseElem).find(".job-timeline-content")[0]).text();
         var stageIdAndAttempt = stageIdText.match("\\(Stage (\\d+\\.\\d+)\\)")[1].split(".");
-        return stageIdAndAttempt;
+        return "#stage-" + stageIdAndAttempt[0] + "-" + stageIdAndAttempt[1];
       };
 
       $(this).click(function() {
-        var idAndAttempt = getStageIdAndAttempt(this);
-        var id = idAndAttempt[0];
-        var attempt = idAndAttempt[1];
-        window.location.href = "../../stages/stage/?id=" + id + "&attempt=" + attempt;
+        var stagePagePath = $(getSelectorForStageEntry(this)).find("a").attr("href")
+        window.location.href = stagePagePath
       });
 
       $(this).hover(
         function() {
-          var idAndAttempt = getStageIdAndAttempt(this);
-          var id = idAndAttempt[0];
-          var attempt = idAndAttempt[1];
-          $("#stage-" + id + "-" + attempt).addClass("corresponding-item-hover");
+          $(getSelectorForStageEntry(this)).addClass("corresponding-item-hover");
           $($(this).find("div.job-timeline-content")[0]).tooltip("show");
         },
         function() {
-          var idAndAttempt = getStageIdAndAttempt(this);
-          var id = idAndAttempt[0];
-          var attempt = idAndAttempt[1];
-          $("#stage-" + id + "-" + attempt).removeClass("corresponding-item-hover");
+          $(getSelectorForStageEntry(this)).removeClass("corresponding-item-hover");
           $($(this).find("div.job-timeline-content")[0]).tooltip("hide");
         }
       );