DeprecationWarnings that had to be corrected in Juno release

[Peter Razumovsky]

When I run tox -epy27, I get next DeprecationWarnings:

heat/engine/service.py:346: DeprecationWarning: The "instance_user" option in heat.conf is deprecated and will be removed in the Juno release.
  'release.', DeprecationWarning)
heat/engine/service.py:346: DeprecationWarning: The "instance_user" option in heat.conf is deprecated and will be removed in the Juno release.
  'release.', DeprecationWarning)
heat/engine/service.py:346: DeprecationWarning: The "instance_user" option in heat.conf is deprecated and will be removed in the Juno release.
  'release.', DeprecationWarning)
heat/engine/service.py:346: DeprecationWarning: The "instance_user" option in heat.conf is deprecated and will be removed in the Juno release.
  'release.', DeprecationWarning)
heat/engine/service.py:346: DeprecationWarning: The "instance_user" option in heat.conf is deprecated and will be removed in the Juno release.
  'release.', DeprecationWarning)

Also, beside these warnings there are another DeprecationWarnings:

heat/engine/environment.py:223: UserWarning: OS::Heat::CWLiteAlarm is deprecated, use OS::Ceilometer::Alarm instead.
  warnings.warn(six.text_type(info.value.support_status.message))
heat/engine/environment.py:223: UserWarning: RouterGateway resource is deprecated and should not be used. Instead use the `external_gateway_info` property in the router resource to set up the gateway.
  warnings.warn(six.text_type(info.value.support_status.message))

heat/engine/resources/neutron/neutron.py:153: UserWarning: neutron.NeutronResource.get_secgroup_uuids is deprecated. Use self.client_plugin("neutron").get_secgroup_uuids
  warnings.warn('neutron.NeutronResource.get_secgroup_uuids is '
heat/engine/environment.py:223: UserWarning: OS::Heat::CWLiteAlarm is deprecated, use OS::Ceilometer::Alarm instead.
  warnings.warn(six.text_type(info.value.support_status.message))

How do you think:
1) whether it is time to correct DeprecationWarnings of Juno release?
2) Is there any reason not to correct other DeprecationWarnings?

[Steven Hardy (shardy)]

We should've removed the "instance_user" option in Juno like we said we would, so I guess the only thing to do is to remove it in Kilo, e.g now.

For the CWLiteAlarm warning, I don't think there is anything to do, as we're not ready to remove that resource yet.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/131518

[OpenStack Infra (hudson-openstack)]

Change abandoned by Peter Razumovsky (<email address hidden>) on branch: master
Review: https://review.openstack.org/131518
Reason: dupe of https://review.openstack.org/#/c/103928/

[Peter Razumovsky (prazumovsky)]

Currently no DeprecationWarning raises, so -> Fix Released.