remove useless file: dashboards/admin/dashboard.py
remove useless file: dashboards/admin/dashboard.py

Change-Id: I789596ecb4587e156fb5af0f60ad922a03fb1bc1

openstack/cloudkitty-dashboard,stackforge/cloudkitty-dashboard,openstack/cloudkitty-dashboard,stackforge/cloudkitty-dashboard,stackforge/cloudkitty-dashboard,openstack/cloudkitty-dashboard