HDFS-12301. NN File Browser UI: Navigate to a path when enter is pressed

(cherry picked from commit f34646d652310442cb5339aabbbb269f10dfa838)
(cherry picked from commit 895a35eac0422c1845ebe3c5bed1ac2bda1ac807)
(cherry picked from commit a611922de4e2fc82506872d68c4efcb963fb15e9)

hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs/explorer.js

@@ -337,6 +337,12 @@
 
     var b = function() { browse_directory($('#directory').val()); };
     $('#btn-nav-directory').click(b);
+    //Also navigate to the directory when a user presses enter.
+    $('#directory').on('keyup', function (e) {
+      if (e.which == 13) {
+        browse_directory($('#directory').val());
+      }
+    });
     var dir = window.location.hash.slice(1);
     if(dir == "") {
       window.location.hash = "/";