zuul: Move tempest-integrated-compute to Focal

The recently uncovered undefined QEMU behaviour when sending multiple
requests to detach a device should now be avoided with the introduction
of Ib9ed7069cef5b73033351f7a78a3fb566753970d allowing this job to move
to Focal on master as defined in the devstack-minimal base job.

Related-Bug: #1882521
Related-Bug: #1894804

Depends-On: https://review.opendev.org/#/c/755799/
Change-Id: Ic66285ef5dcefa9556c34cda42744ea30902cd37
diff --git a/.zuul.yaml b/.zuul.yaml
index 5e3f33a..c682fd4 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -218,7 +218,6 @@
 - job:
     name: tempest-integrated-compute
     parent: devstack-tempest
-    nodeset: openstack-single-node-bionic
     branches: ^(?!stable/ocata).*$
     description: |
       This job runs integration tests for compute. This is