Enhancement request to add IP address of Nexus switch in debug log message.

[Danny Choi]

In screen-q-svc.log, the Nexus switch IP address info is displayed only during initialization.
E.g.
2015-01-21 20:30:47.569 DEBUG neutron.plugins.ml2.drivers.cisco.nexus.mech_cisco_nexus [-] nexus_switches found = {('172.20.231.7, ''qa6'): '1/3', ('172.22.191.67, ''qa11'):

For debugging, it would be very helpful if this info is displayed when the ml2 driver try to configure the Nexus switch.

[Danny Choi (dannchoi)]

Fix submitted by Rich Curran:

commit bc8dd07305316fbbf06ae0173123d862b07096f4
Author: Rich Curran <email address hidden>
Date: Mon Feb 2 11:28:02 2015 -0500

    ML2 Cisco Nexus MD: Update exception with switch IP address

    Add IP address of Nexus switch in exception message.

    Change-Id: I5e2f9224a6971248011f503c9c774c799a8785b8
    Closes-Bug: #1413822

[Danny Choi (dannchoi)]

2015-02-14 17:57:56.824 ERROR neutron.plugins.ml2.managers [req-01c58ade-d1d0-4bbf-b192-6cfea8cd0356 None None] Mechanism driver 'cisco_nexus' failed in update_port_postcommit
2015-02-14 17:57:56.824 TRACE neutron.plugins.ml2.managers Traceback (most recent call last):
2015-02-14 17:57:56.824 TRACE neutron.plugins.ml2.managers File "/opt/stack/neutron/neutron/plugins/ml2/managers.py", line 299, in _call_on_drivers
2015-02-14 17:57:56.824 TRACE neutron.plugins.ml2.managers getattr(driver.obj, method_name)(context)
2015-02-14 17:57:56.824 TRACE neutron.plugins.ml2.managers File "/opt/stack/neutron/neutron/openstack/common/lockutils.py", line 272, in inner
2015-02-14 17:57:56.824 TRACE neutron.plugins.ml2.managers return f(*args, **kwargs)
2015-02-14 17:57:56.824 TRACE neutron.plugins.ml2.managers File "/opt/stack/neutron/neutron/plugins/ml2/drivers/cisco/nexus/mech_cisco_nexus.py", line 620, in update_port_postcommit
2015-02-14 17:57:56.824 TRACE neutron.plugins.ml2.managers self._configure_host_entries, vni)
2015-02-14 17:57:56.824 TRACE neutron.plugins.ml2.managers File "/opt/stack/neutron/neutron/plugins/ml2/drivers/cisco/nexus/mech_cisco_nexus.py", line 529, in _port_action_vlan
2015-02-14 17:57:56.824 TRACE neutron.plugins.ml2.managers func(vlan_id, device_id, host_id, vni, is_provider)
2015-02-14 17:57:56.824 TRACE neutron.plugins.ml2.managers File "/opt/stack/neutron/neutron/plugins/ml2/drivers/cisco/nexus/mech_cisco_nexus.py", line 383, in _configure_host_entries
2015-02-14 17:57:56.824 TRACE neutron.plugins.ml2.managers vni)
2015-02-14 17:57:56.824 TRACE neutron.plugins.ml2.managers File "/opt/stack/neutron/neutron/plugins/ml2/drivers/cisco/nexus/mech_cisco_nexus.py", line 336, in _configure_port_binding
2015-02-14 17:57:56.824 TRACE neutron.plugins.ml2.managers vni)
2015-02-14 17:57:56.824 TRACE neutron.plugins.ml2.managers File "/opt/stack/neutron/neutron/plugins/ml2/drivers/cisco/nexus/nexus_network_driver.py", line 322, in create_and_trunk_vlan
2015-02-14 17:57:56.824 TRACE neutron.plugins.ml2.managers self.create_vlan(nexus_host, vlan_id, vlan_name, vni)
2015-02-14 17:57:56.824 TRACE neutron.plugins.ml2.managers File "/opt/stack/neutron/neutron/plugins/ml2/drivers/cisco/nexus/nexus_network_driver.py", line 239, in create_vlan
2015-02-14 17:57:56.824 TRACE neutron.plugins.ml2.managers allowed_exc_strs=["VLAN with the same name exists"])
2015-02-14 17:57:56.824 TRACE neutron.plugins.ml2.managers File "/opt/stack/neutron/neutron/plugins/ml2/drivers/cisco/nexus/nexus_network_driver.py", line 113, in _edit_config
2015-02-14 17:57:56.824 TRACE neutron.plugins.ml2.managers exc=e)

2015-02-14 17:57:56.824 TRACE neutron.plugins.ml2.managers NexusConfigFailed: Failed to configure Nexus switch: 172.20.231.5 XML: <<<<<<<

2015-02-14 17:57:56.824 TRACE neutron.plugins.ml2.managers <config xmlns:xc="urn:ietf:params:xml:ns:netconf:base:1.0">
2015-02-14 17:57:56.824 TRACE neutron.plugins.ml2.managers <configure>
2015-02-14 17:57:56.824 TRACE neutron.plugins.ml2.managers <__XML__MODE__exec_configure>
2015-02-14 17:57:56.824 TRACE neutron.plugins.ml2.managers ...