This fixes one missing comma in octavia dashboard configuration to
fix the syntax error.
Closes-Bug: #2015271
Change-Id: If896f922db09396415a095fb9a8062eca32a9d06
This change introduces the new horizon::dashboards::octavia class,
which allows users to manage the independent configuration file for
octavia dashboard (_1499_load_balancer_settings.py).
Change-Id: I54f7fb778bc2487bf977e23e193773d627d91dd9