Summary: KVM - double migration can fail

Detail: Undefine VM after migration. Lingering domain definitions cause
migrations back to the original host to fail, since domain already exists.

BUG-ID: CLOUDSTACK-2640
Bugfix-for: 4.1.0,4.2.0
Signed-off-by: Marcus Sorensen <marcus@betterservers.com> 1369285950 -0600

plugins/hypervisors/kvm/src/com/cloud/hypervisor/kvm/resource/LibvirtComputingResource.java

@@ -2728,6 +2728,9 @@ ServerResource {
         } finally {
             try {
                 if (dm != null) {
+                    if (dm.isPersistent() == 1) {
+                        dm.undefine();
+                    }
                     dm.free();
                 }
                 if (dconn != null) {