Revert "zuul: Skip block migration with attached volumes tests due to bug #1931702"

This reverts commit 7c478ac.

With the resolution of bug #1945983 in devstack we should also be able
to start testing block migration with attached volumes once again.

Closes-Bug: #1931702
Depends-On: https://review.opendev.org/c/openstack/devstack/+/812391
Depends-On: https://review.opendev.org/c/openstack/devstack/+/812925
Change-Id: I1cb7a8f76c372d19227315361ecf5ff730ec6c36

Author: lyarwood

.zuul.yaml

@@ -116,8 +116,7 @@
             compute-feature-enabled:
               volume_backed_live_migration: true
               block_migration_for_live_migration: true
-              # NOTE(lyarwood): Skip until bug #1931702 is resolved.
-              block_migrate_cinder_iscsi: false
+              block_migrate_cinder_iscsi: true
     post-run: playbooks/nova-live-migration/post-run.yaml
 
 - job:
@@ -493,8 +492,7 @@
               live_migration: true
               volume_backed_live_migration: true
               block_migration_for_live_migration: true
-              # NOTE(lyarwood): Skip until bug #1931702 is resolved.
-              block_migrate_cinder_iscsi: false
+              block_migrate_cinder_iscsi: true
       tox_envlist: all
       tempest_test_regex: ((tempest\.(api\.compute|scenario)\..*smoke.*)|(^tempest\.api\.compute\.admin\.(test_live_migration|test_migration)))