message: added edit button to security group card
diff: -<mdl-card class="custom-card" mdl-shadow="2" (click)="onClick.emit()">
  +<mdl-card class="custom-card" mdl-shadow="2">
  <mdl-card-title>
  <h2 mdl-card-title-text>{{ securityGroupTemplate.name }}</h2>
  </mdl-card-title>
  </div>
  </mdl-card-supporting-text>
  <mdl-card-actions>
  + <button
  + mdl-button
  + disabled="{{ securityGroupTemplate.isPredefinedTemplate() }}"
  + (click)="onClick.emit()"
  + >
  + {{ 'EDIT' | translate }}
  + </button>
  <button
  mdl-button
  disabled="{{ securityGroupTemplate.isPredefinedTemplate() }}"
  