Fixes IronicApiService.deleteNode
Fixes IronicApiService.deleteNode

IronicApiService.deleteNode still uses the old "when(request(...))"
format to make xhr request, not the refactored "this.defaultRequest"
method. This patch fixes that.

Change-Id: Iaf4cc1664a5fc61f84f91bbb2b54f79860b1ce34

knowncitizen/tripleo-ui,knowncitizen/tripleo-ui,knowncitizen/tripleo-ui,knowncitizen/tripleo-ui