Extend network debug infos on network failures

After the https://review.openstack.org/#/c/76640/ is merge tempest will
be allowed to dump the ovs db.

The ovs db dump can help in identifying trunk/access port miss configuration
issues.

Change-Id: Ia751dc5046ce07369b9044eda3b20c63d38bac99

tempest/common/commands.py

@@ -73,3 +73,7 @@ def ip_ns_route(ns):
 
 def iptables_ns(ns, table):
     return ip_ns_exec(ns, "iptables -v -S -t " + table)
+
+
+def ovs_db_dump():
+    return sudo_cmd_call("ovsdb-client dump")

tempest/common/debug.py

@@ -38,3 +38,15 @@ def log_ip_ns():
         for table in ['filter', 'nat', 'mangle']:
             LOG.info('ns(%s) table(%s):\n%s', ns, table,
                      commands.iptables_ns(ns, table))
+
+
+def log_ovs_db():
+    if not CONF.debug.enable or not CONF.service_available.neutron:
+        return
+    db_dump = commands.ovs_db_dump()
+    LOG.info("OVS DB:\n" + db_dump)
+
+
+def log_net_debug():
+    log_ip_ns()
+    log_ovs_db()

tempest/scenario/test_minimum_basic.py

@@ -97,7 +97,7 @@ class TestMinimumBasicScenario(manager.OfficialClientTest):
         except Exception:
             LOG.exception('ssh to server failed')
             self._log_console_output()
-            debug.log_ip_ns()
+            debug.log_net_debug()
             raise
 
     def check_partitions(self):

tempest/scenario/test_network_basic_ops.py

@@ -199,7 +199,7 @@ class TestNetworkBasicOps(manager.NetworkScenarioTest):
         except Exception:
             LOG.exception('Tenant connectivity check failed')
             self._log_console_output(servers=self.servers.keys())
-            debug.log_ip_ns()
+            debug.log_net_debug()
             raise
 
     def _create_and_associate_floating_ips(self):
@@ -231,7 +231,7 @@ class TestNetworkBasicOps(manager.NetworkScenarioTest):
                 ex_msg += ": " + msg
             LOG.exception(ex_msg)
             self._log_console_output(servers=self.servers.keys())
-            debug.log_ip_ns()
+            debug.log_net_debug()
             raise
 
     def _disassociate_floating_ips(self):

tempest/scenario/test_security_groups_basic_ops.py

@@ -366,7 +366,7 @@ class TestSecurityGroupsBasicOps(manager.NetworkScenarioTest):
                                                            should_succeed),
                             msg)
         except Exception:
-            debug.log_ip_ns()
+            debug.log_net_debug()
             raise
 
     def _test_in_tenant_block(self, tenant):