Hostname of server is not updated when update instance name

[huangtianhua]

Currently we can update instance name and description using update API,
but it only performs update in data in DB, the hostname in VM is still
unchanged.

1. create a server with name 'old'
2. update the name of server to 'new'
3. get the details of server from nova, the name has been updated
4. restart (stop and then start)/reboot the nova server
5. login the server, and found the hostname has not been udpate to 'new'

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/404583

[melanie witt (melwitt)]

I don't think this is a bug or defect, that is, such a change would be a deliberate change of functionality that would need a spec.

[OpenStack Infra (hudson-openstack)]

Change abandoned by Stephen Finucane (<email address hidden>) on branch: master
Review: https://review.openstack.org/404583

[Matt Riedemann (mriedem)]

As noted this isn't a bug, so marking it invalid. Would require a spec to change this behavior, but I doubt we'd do it, since nova shouldn't have access to the guest once it's created. You'd have to rebuild the server if you wanted to change the hostname in the guest.