Add iptables and listening sockets to debug info

The method "_log_local_network_status", used to print the system
information in case of error, is improved with new information:
- The local namespace iptables
- The local namespace listening sockets

This information could provide the needed info to investigate the
problem, related in the referred bug, when a VM cannot retrieve
the metadata information.

Change-Id: Id56743a07267b4b6c03e7b9b295f919668ac07ab
Related-Bug: #1923633

neutron_tempest_plugin/common/ip.py

@@ -383,6 +383,23 @@ def arp_table(namespace=None):
     return arp_table
 
 
+def list_iptables(version=constants.IP_VERSION_4, namespace=None):
+    cmd = ''
+    if namespace:
+        cmd = 'sudo ip netns exec %s ' % namespace
+    cmd += ('iptables-save' if version == constants.IP_VERSION_4 else
+            'ip6tables-save')
+    return shell.execute(cmd).stdout
+
+
+def list_listening_sockets(namespace=None):
+    cmd = ''
+    if namespace:
+        cmd = 'sudo ip netns exec %s ' % namespace
+    cmd += 'netstat -nlp'
+    return shell.execute(cmd).stdout
+
+
 class Route(HasProperties,
             collections.namedtuple('Route',
                                    ['dest', 'properties'])):

neutron_tempest_plugin/scenario/base.py

@@ -325,7 +325,9 @@ class BaseTempestTestCase(base_api.BaseNetworkTest):
         try:
             local_ips = ip_utils.IPCommand(namespace=ns_name).list_addresses()
             local_routes = ip_utils.IPCommand(namespace=ns_name).list_routes()
-            arp_table = ip_utils.arp_table()
+            arp_table = ip_utils.arp_table(namespace=ns_name)
+            iptables = ip_utils.list_iptables(namespace=ns_name)
+            lsockets = ip_utils.list_listening_sockets(namespace=ns_name)
         except exceptions.ShellCommandFailed:
             LOG.debug('Namespace %s has been deleted synchronously during the '
                       'host network collection process', ns_name)
@@ -337,6 +339,8 @@ class BaseTempestTestCase(base_api.BaseNetworkTest):
                   ns_name, '\n'.join(str(r) for r in local_routes))
         LOG.debug('Namespace %s; Local ARP table:\n%s',
                   ns_name, '\n'.join(str(r) for r in arp_table))
+        LOG.debug('Namespace %s; Local iptables:\n%s', ns_name, iptables)
+        LOG.debug('Namespace %s; Listening sockets:\n%s', ns_name, lsockets)
 
     def _check_remote_connectivity(self, source, dest, count,
                                    should_succeed=True,