VMware Driver reports SwitchNotFound when network already exists

[Sabari Murugesan]

We encounter SwitchNotFoundForNetworkAdapter exception even when the network (port group) specified in flat_network_bridge exists with the vCenter host.

The driver should only check for the existence of the switch if the network is not found and it needs to create the port group on the host.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/46824

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/46824
Committed: http://github.com/openstack/nova/commit/65113fc6274d26552bae2db35427edcdbc683fe3
Submitter: Jenkins
Branch: master

commit 65113fc6274d26552bae2db35427edcdbc683fe3
Author: Sabari Kumar Murugesan <email address hidden>
Date: Mon Sep 16 12:45:59 2013 -0700

    VMware: Fix SwitchNotFound error when network exists

    In FlatNetworking mode, when a virtual network exists on the vCenter
    host we still check for the presence of a physical adapter specified
    in vlan_interface. This check is only needed if we are going to
    create a new network on the vswitch associated with the interface.

    This fix removes the check for the physical adapter and the vswitch
    when network already exists.

    Fixes: bug #1226238
    Change-Id: I1eecf2c339534d8694ec6a8bdfaff5217ba2f8ef