This patch updates the imported code to reflect octavia-dashboard.
More work is required to make this work with the Octavia v2 API.
This will be done in followup patches.
Currently calling clean.sh leads to NEUTRON_LBAAS_DASHBOARD_ENABLE_FILE
being deleted. The problem is that this variable contains path to a
file in neutron-lbaas-dashboard directory, not its copy in Horizon
directory. This patch fixes this by deleting proper files.