Because vmware plugin config nsx.ini is now moved
from neutron:/etc/neutron/plugins/vmware/ to vmware-nsx:/etc/,
we need to update associated references in setup.cfg.
The new path to nsx.ini is defined in Q_PLUGIN_SRC_CONF_PATH.
This is the first part of vmware plugin decomposition
(etc, extensions, and database).
Partial-bug: #1483453
Depends-On: I3caf25ce91ff425d815f35ed3efd599a572d595b
Change-Id: I326dc1eaf549ac631caf71e9adc3c7a218a7723f
9641d4987e