tempest: Enable shelve_migrate tests with Libvirt

Enable the compute feature for shelve_migrate on all but LXC and
Xen virt_types.

Related-Bug: #1732428
Depends-On: https://review.opendev.org/#/c/696084/
Change-Id: I31cd00c9117607682213cfa0399709e560f4ad0d
diff --git a/lib/tempest b/lib/tempest
index 125749b..58588b7 100644
--- a/lib/tempest
+++ b/lib/tempest
@@ -569,6 +569,7 @@
             iniset $TEMPEST_CONFIG compute-feature-enabled snapshot False
             iniset $TEMPEST_CONFIG compute-feature-enabled suspend False
         else
+            iniset $TEMPEST_CONFIG compute-feature-enabled shelve_migrate True
             iniset $TEMPEST_CONFIG compute-feature-enabled stable_rescue True
             iniset $TEMPEST_CONFIG compute-feature-enabled swap_volume True
         fi