IMPALA-13105: Fix multiple imported query profiles fail to import/clear at once

On importing multiple query profiles, insertion of the last query in the
queue fails as no delay is provided for the insertion.

This has been fixed by providing a delay after inserting the final query.

On clearing all the imported queries, in some instances page reloads
before clearing the IndexedDB object store.

This has been fixed by triggering the page reload after clearing
the object store succeeds.

Change-Id: I42470fecd0cff6e193f080102575e51d86a2d562
Reviewed-on: http://gerrit.cloudera.org:8080/21450
Reviewed-by: Wenzhe Zhou <wzhou@cloudera.com>
Reviewed-by: Riza Suminto <riza.suminto@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>

Author: llsuryall

www/queries.tmpl

@@ -282,8 +282,9 @@ command line parameter.</p>
   }
 
   function clearProfiles() {
-    db.transaction("profiles", "readwrite").objectStore("profiles").clear();
-    setScrollReload();
+    db.transaction("profiles", "readwrite").objectStore("profiles").clear().onsuccess = () => {
+      setScrollReload();
+    }
   }
 
   function uploadProfile() {
@@ -330,7 +331,7 @@ command line parameter.</p>
           profileStore.put(query).onsuccess = () => {
             uploadCount++;
             if (uploadCount == json_profile_chooser.files.length) {
-              setScrollReload();
+              setTimeout(setScrollReload, 1000);
             }
           };
         } catch (err) {