[RFE] Add a new API endpoint /service

[Madhuri Kumari]

Currently in Ironic, there is no way to check the status of conductors running. So this proposal is to add a new API endpoint /services which show similar info like:

+---------------------+---------------------+----+----------+--------------------------------------------------------------------+--------+
| created_at | updated_at | id | hostname | drivers | online |
+---------------------+---------------------+----+----------+--------------------------------------------------------------------+--------+
| 2017-02-09 07:25:01 | 2017-04-27 10:08:52 | 1 | devstack | ["fake", "agent_ipmitool", "pxe_ssh", "agent_ssh", "pxe_ipmitool"] | 1 |
+---------------------+---------------------+----+----------+--------------------------------------------------------------------+--------+

Use case for this new API:

1. FWIW I'd indeed like to have it, at least to report which conductor is managing which node currently (or at least was recently) - right now there is a problem for operators to find on which conductor to grep for logs of a failed deployment :) from pas-ha
2. my personal opinion is that it might be interesting to have just to be able to health check Ironic from sambetts

IRC logs: http://eavesdrop.openstack.org/irclogs/%23openstack-ironic/%23openstack-ironic.2017-04-27.log.html#t2017-04-27T10:00:30

[Ruby Loo (rloo)]

Thanks Madhuri. Might want to consolidate this with https://bugs.launchpad.net/ironic/+bug/1616878.

[Madhuri Kumari (madhuri-rai07)]

Thanks Ruby. We can mark this bug as duplicate. I don't have authority to change.