Enable virt.vmwareapi test cases on Python

Enable unstable test one by one and figure out failure easily when
it fails again.

Partially-Implements: blueprint goal-python35

Change-Id: I6c373abff887fc44add59a6dbb6620af0340915d

tests-py3.txt

@@ -4,8 +4,6 @@ nova.tests.unit.test_wsgi.TestWSGIServerWithSSL
 # NOTE(dims): The following tests randomly fail in the gate. Please be
 # careful before you re-enable them
 ##########################################################################
-nova.tests.unit.virt.vmwareapi.test_configdrive.ConfigDriveTestCase
-nova.tests.unit.virt.vmwareapi.test_driver_api.VMwareAPIVMTestCase
 nova.tests.unit.virt.xenapi.test_vmops.BootableTestCase
 nova.tests.unit.virt.xenapi.test_vmops.SpawnTestCase
 nova.tests.unit.virt.xenapi.test_volumeops.VolumeDetachTestCase