libvirt: stop enabling hyperv feature reenlightenment

The 'reenlightenment' hyperv enlightenment will cause
instances live-migration to fail (KVM currently doesn’t
fully support reenlightenment notifications, see
www.qemu.org/docs/master/system/i386/hyperv.html),
so don't enable it now.

Change-Id: I6821819450bc96e4304125ea3b76a0e462e6e33f
Closes-Bug: #2046549
Related-Bug: #2009280

nova/tests/unit/virt/libvirt/test_driver.py

@@ -28048,7 +28048,9 @@ class LibvirtDriverTestCase(test.NoDBTestCase, TraitsComparisonMixin):
         self.assertTrue(hv.synic)
         self.assertTrue(hv.reset)
         self.assertTrue(hv.frequencies)
-        self.assertTrue(hv.reenlightenment)
+        # NOTE(jie) reenlightenment will cause instances live-migration
+        # failure, so don't enable it now. See bug 2046549.
+        self.assertFalse(hv.reenlightenment)
         self.assertTrue(hv.tlbflush)
         self.assertTrue(hv.ipi)
         self.assertTrue(hv.evmcs)

nova/virt/libvirt/driver.py

@@ -6262,7 +6262,6 @@ class LibvirtDriver(driver.ComputeDriver):
             hv.synic = True
             hv.reset = True
             hv.frequencies = True
-            hv.reenlightenment = True
             hv.tlbflush = True
             hv.ipi = True
             hv.evmcs = True