create: flow scaffolding
create: match_pattern and action_pattern scaffolding
change: relation between flow, match_pattern and action_pattern in model
change: rename table_id to flow_table_id
create: flow_table scaffolding
create: device scaffolding
change: basic depencies between flows, main_services, services and flow_tables
change: basic depencies between flow_tables, devices and opendaylights
change: migrate db