Add segments attribute to OS::Neutron::ProviderNet

Adds a attribute to the neutron ProviderNet resource to get the
segments of a provider network.

Change-Id: I27656822fd10dffbcaeda016c27a47974313a65d
Story: 2007260
Task: 38622

heat/engine/resources/openstack/neutron/provider_net.py

@@ -46,9 +46,9 @@ class ProviderNet(net.Net):
     )
 
     ATTRIBUTES = (
-        STATUS, SUBNETS,
+        STATUS, SUBNETS, SEGMENTS,
     ) = (
-        'status', 'subnets',
+        'status', 'subnets', 'segments',
     )
 
     NETWORK_TYPES = (
@@ -121,6 +121,11 @@ class ProviderNet(net.Net):
             _("Subnets of this network."),
             type=attributes.Schema.LIST
         ),
+        SEGMENTS: attributes.Schema(
+            _("The segments of this network."),
+            type=attributes.Schema.LIST,
+            support_status=support.SupportStatus(version='16.0.0'),
+        ),
     }
 
     def validate(self):

releasenotes/notes/providernet-segments-attribute-cc20b22bf3a25e96.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - Adds a new ``segments`` attribute to the ``OS::Neutron::ProviderNet``
+    resource. The attribute resolves the segments of the network.