Use ipv4 subnet in Heat scenario tests

Previously we used first subnet from network and it was correct, because
there was only one subnet in network by default. According to the last changes
in devstack new ipv6 subnet was added to the all default networks.
This patch adds function to the base class, which allows to choose
subnet based on ip version. All scenario tests were updated to use only ipv4
subnet.

Also was added property for FIP, which specify ip of vip.

Change-Id: I199075909b97fe98e1a3c1d175b0b4cf7100403d
Closes-Bug: #1449896

heat_integrationtests/common/test.py

@@ -172,6 +172,12 @@ class HeatIntegrationTest(testscenarios.WithScenarios,
             if net['name'] == net_name:
                 return net
 
+    def _get_subnet_by_version(self, network, ip_version=4):
+        for subnet_id in self.net['subnets']:
+            subnet_info = self.network_client.show_subnet(subnet_id)
+            if subnet_info['subnet']['ip_version'] == ip_version:
+                return subnet_id
+
     @staticmethod
     def _stack_output(stack, output_key):
         """Return a stack output value for a given key."""

heat_integrationtests/scenario/scenario_base.py

@@ -25,6 +25,7 @@ class ScenarioTestsBase(test.HeatIntegrationTest):
         if not self.conf.fixed_network_name:
             raise self.skipException("No default network configured to test")
         self.net = self._get_network()
+        self.subnet_v4 = self._get_subnet_by_version(self.net)
 
         if not self.conf.image_ref:
             raise self.skipException("No image configured to test")

heat_integrationtests/scenario/templates/test_neutron_loadbalancer.yaml

@@ -106,6 +106,8 @@ resources:
        floating_network: { get_param: external_network_id }
        port_id:
          { get_attr: [test_pool, vip, 'port_id'] }
+       fixed_ip_address:
+         { get_attr: [test_pool, vip, 'address'] }
 
   LBaaS:
     type: OS::Neutron::LoadBalancer

heat_integrationtests/scenario/test_neutron_loadbalancer.py

@@ -55,7 +55,7 @@ class NeutronLoadBalancerTest(scenario_base.ScenarioTestsBase):
             'key_name': self.keypair_name,
             'flavor': self.conf.minimal_instance_type,
             'image': self.conf.image_ref,
-            'private_subnet_id': self.net['subnets'][0],
+            'private_subnet_id': self.subnet_v4,
             'external_network_id': self.public_net['id'],
             'timeout': self.conf.build_timeout
         }

heat_integrationtests/scenario/test_server_cfn_init.py

@@ -91,11 +91,11 @@ class CfnInitIntegrationTest(scenario_base.ScenarioTestsBase):
                via generated keypair.
         """
         parameters = {
-            "key_name": self.keypair_name,
-            "flavor": self.conf.instance_type,
-            "image": self.conf.image_ref,
-            "timeout": self.conf.build_timeout,
-            "subnet": self.net["subnets"][0],
+            'key_name': self.keypair_name,
+            'flavor': self.conf.instance_type,
+            'image': self.conf.image_ref,
+            'timeout': self.conf.build_timeout,
+            'subnet': self.subnet_v4,
         }
 
         # Launch stack