[ADF-868] Use new ADF prefix in all tags (#2035)

* use new ADF prefix in all thr tag

* fix failing test

* fix datatable test

ng2-components/ng2-activiti-form/src/components/activiti-content.component.ts

@@ -22,7 +22,7 @@ import { ContentLinkModel } from './widgets/core/content-link.model';
 import { Observable } from 'rxjs/Rx';
 
 @Component({
-    selector: 'activiti-content',
+    selector: 'adf-content, activiti-content',
     templateUrl: './activiti-content.component.html',
     styleUrls: ['./activiti-content.component.css']
 })

ng2-components/ng2-activiti-form/src/components/activiti-form.component.ts

@@ -29,7 +29,7 @@ import { WidgetVisibilityService }  from './../services/widget-visibility.servic
 declare var componentHandler: any;
 
 @Component({
-    selector: 'activiti-form',
+    selector: 'adf-form, activiti-form',
     templateUrl: './activiti-form.component.html',
     styleUrls: ['./activiti-form.component.css']
 })

ng2-components/ng2-activiti-form/src/components/activiti-start-form.component.ts

@@ -51,7 +51,7 @@ import { ContentLinkModel } from './widgets/core/content-link.model';
  * @returns {ActivitiForm} .
  */
 @Component({
-    selector: 'activiti-start-form',
+    selector: 'adf-start-form, activiti-start-form',
     templateUrl: './activiti-start-form.component.html',
     styleUrls: ['./activiti-form.component.css']
 })

ng2-components/ng2-activiti-form/src/components/widgets/display-value/display-value.widget.html

@@ -47,13 +47,13 @@
     <div *ngSwitchCase="'upload'">
         <div *ngIf="hasFile" class="mdl-grid">
             <div *ngFor="let file of field.value" class="mdl-cell mdl-cell--6-col">
-                <activiti-content [id]="file.id" [showDocumentContent]="showDocumentContent"></activiti-content>
+                <adf-content [id]="file.id" [showDocumentContent]="showDocumentContent"></adf-content>
             </div>
         </div>
     </div>
     <div *ngSwitchCase="'document'">
         <div *ngIf="hasFile">
-            <activiti-content [id]="id" [showDocumentContent]="true"></activiti-content>
+            <adf-content [id]="id" [showDocumentContent]="true"></adf-content>
         </div>
     </div>
     <div *ngSwitchDefault