Switch from FLAGS to CONF in tests

Use the global CONF variable instead of FLAGS. This is purely a cleanup
since FLAGS is already just another reference to CONF.

We leave the nova.flags imports until a later cleanup commit since
removing them may cause unpredictable problems due to config options not
being registered.

Change-Id: Ic0168188dfe214fc81af04c8a9644d2d9f31600d

nova/tests/test_vmwareapi.py

@@ -32,9 +32,6 @@ from nova.virt.vmwareapi import driver
 from nova.virt.vmwareapi import fake as vmwareapi_fake
 
 
-FLAGS = flags.FLAGS
-
-
 class VMWareAPIVMTestCase(test.TestCase):
     """Unit tests for Vmware API connection calls."""