Deprecate support for Neutron LBaaS

This change deprecates the remaining support for Neutron LBaaS.
The Neutron LBaaS project has been retired in favor of the independent
Octavia project and the current implementation is no longer valid.

Change-Id: If6456e8466013440c8d2340225ff56893f0ac37d

ceilometer/network/services/lbaas.py

@@ -15,6 +15,7 @@
 
 import abc
 import collections
+import warnings
 
 from oslo_log import log
 
@@ -47,6 +48,10 @@ class BaseLBPollster(base.BaseServicesPollster):
         super(BaseLBPollster, self).__init__(conf)
         self.lb_version = self.conf.service_types.neutron_lbaas_version
 
+        warnings.warn('Support for Neutron LBaaS has been deprecated '
+                      'and will be removed in a future release.',
+                      category=DeprecationWarning, stacklevel=3)
+
     def get_load_balancer_status_id(self, value):
         if self.lb_version == 'v1':
             resource_status = self.get_status_id(value)

ceilometer/neutron_client.py

@@ -27,6 +27,8 @@ SERVICE_OPTS = [
                help='Neutron service type.'),
     cfg.StrOpt('neutron_lbaas_version',
                default='v2',
+               deprecated_for_removal=True,
+               deprecated_reason='Neutron LBaaS has been retired',
                choices=('v1', 'v2'),
                help='Neutron load balancer version.')
 ]

releasenotes/notes/deprecate-neutron-lbaas-5a36406cbe44bbe3.yaml

@@ -0,0 +1,5 @@
+---
+deprecations:
+  - |
+    Support for Neutron LBaaS has been officially deprecated. The feature has
+    been useless since the Neutron LBaaS project was retired.