Adapt conformance tests to support migration.
Adapt conformance tests to support migration.

Since conformance tests include a migration tests,
we must set KUBEVIRT_NUM_NODES to 2
in the cluster we create, because libvirt doesnt allow
migrating to the same host.

Fixes: https://github.com/kubevirt/kubevirt/issues/4345

Signed-off-by: Or Shoval <7299abc34af50659adafa6d252dc9c537bb5cf36@redhat.com>

davidvossel/kubevirt,stu-gott/kubevirt,stu-gott/kubevirt,davidvossel/kubevirt,stu-gott/kubevirt,stu-gott/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,davidvossel/kubevirt,davidvossel/kubevirt