Change nodeset that will not enforce to use specific cloud provider

The RHOS DFG Infra team is decommisioning IBM private cloud.
There is no need to make recognition per cloud provider when only one
provider is available.

Signed-off-by: Daniel Pawlik <dpawlik@redhat.com>

Author: danpawlik

.zuul.yaml

@@ -14,7 +14,7 @@
 
 - job:
     name: watcher-operator-base
-    nodeset: centos-9-medium-2x-centos-9-crc-cloud-ocp-4-18-1-3xl-vexxhost
+    nodeset: centos-9-medium-2x-centos-9-crc-cloud-ocp-4-18-1-3xl
     parent: podified-multinode-edpm-deployment-crc-2comp
     description: |
       A multinode EDPM Zuul job which has one ansible controller, one