Add config option for XML support in Networking

The first step to removing XML in Kilo is making XML testing optional.
Stable test configs will need to be updated to enable this feature to prevent
regressions in stable releases.

Change-Id: I30b9565e01c623814a9c503c4b1c26642afed878

etc/tempest.conf.sample

@@ -802,6 +802,9 @@
 # attributes ipv6_ra_mode and ipv6_address_mode (boolean value)
 #ipv6_subnet_attributes = false
 
+# If false, skip all network api tests with xml (boolean value)
+#xml_api = false
+
 
 [object-storage]
 

tempest/api/network/base.py

@@ -62,6 +62,9 @@ class BaseNetworkTest(tempest.test.BaseTestCase):
         super(BaseNetworkTest, cls).resource_setup()
         if not CONF.service_available.neutron:
             raise cls.skipException("Neutron support is required")
+        if getattr(cls, '_interface', None) == 'xml':
+            if not CONF.network_feature_enabled.xml_api:
+                raise cls.skipException('XML API is not enabled')
 
         os = cls.get_client_manager()
 

tempest/config.py

@@ -481,7 +481,10 @@ NetworkFeaturesGroup = [
                 help="Allow the execution of IPv6 subnet tests that use "
                      "the extended IPv6 attributes ipv6_ra_mode "
                      "and ipv6_address_mode"
-                )
+                ),
+    cfg.BoolOpt('xml_api',
+                default=False,
+                help='If false, skip all network api tests with xml')
 ]
 
 messaging_group = cfg.OptGroup(name='messaging',