vmware-nsx: Vendor code split

Devstack support is added using Devstack's external plugins:
https://review.openstack.org/#/c/156526

Asside to the environment variables, the following should be added to
local.conf file:

enable_plugin vmware-nsx https://git.openstack.org/stackforge/vmware-nsx

for the nsx plugin:
    Q_PLUGIN=vmware_nsx
    enable_service vmware_nsx

for the nsx_v plugin:
    Q_PLUGIN=vmware_nsx_v

Partially-Implements: blueprint vmware-nsx-v

Change-Id: I4e03d4953bf9b5112ff75a252b61c27fadd04bf1
Signed-off-by: Roey Chen <roeyc@vmware.com>
diff --git a/lib/neutron_plugins/vmware_nsx_v b/lib/neutron_plugins/vmware_nsx_v
new file mode 100644
index 0000000..3d33c65
--- /dev/null
+++ b/lib/neutron_plugins/vmware_nsx_v
@@ -0,0 +1,10 @@
+#!/bin/bash
+#
+# This file is needed so Q_PLUGIN=vmware_nsx_v will work.
+
+# FIXME(salv-orlando): This function should not be here, but unfortunately
+# devstack calls it before the external plugins are fetched
+function has_neutron_plugin_security_group {
+    # 0 means True here
+    return 0
+}