Support senlin-manage service list

This BP aims to add senlin engine status report. Since senlin support multi-engine and multi-host, but there's no way to check the status of these engines, this BP wil add command 'senlin-mange service list' for senlin.

Propose change:
1. Add db table to record engine status.
2. Add command senlin-mange service list to show senlin status.

the DB table for senlin engine will contain following columns:
ID : record id
engine_id: engine id
binary: for now we only have 'senlin-engine'
create_at:
update_at:
host: engine running host
topic: engine listening topic
disabled: disable this engine
disabled_reason: disabled reason