Properly namespace nodes

We have a global namespace, thus request that jobs and nodes are
prefixed by repo name. Do this for the nodes.

Btw. these nodes can also be proposed in openstack-zuul-jobs repo.

Change-Id: I84974ea78a759656e31b20f8ada70a0b0727c403

zuul.d/infrared.yaml

@@ -48,7 +48,7 @@
 - job:
     name: tobiko-tox-infrared-centos-8
     parent: tobiko-tox-infrared
-    nodeset: centos-8-2-node
+    nodeset: tobiko-centos-8-2-node
     voting: true
     description: |
       Run test cases using tobiko infrared plugin on CentOS 8
@@ -57,7 +57,7 @@
 - job:
     name: tobiko-tox-infrared-fedora-latest
     parent: tobiko-tox-infrared
-    nodeset: fedora-latest-2-node
+    nodeset: tobiko-fedora-latest-2-node
     voting: false
     description: |
       Run test cases using tobiko infrared plugin on latest Fedora
@@ -75,7 +75,7 @@
 - job:
     name: tobiko-tox-infrared-ubuntu-focal
     parent: tobiko-tox-infrared
-    nodeset: ubuntu-focal-2-node
+    nodeset: tobiko-ubuntu-focal-2-node
     voting: false
     description: |
       Run test cases using tobiko infrared plugin on Ubuntu Focal

zuul.d/nodes.yaml

@@ -1,5 +1,5 @@
 - nodeset:
-    name: centos-8-2-node
+    name: tobiko-centos-8-2-node
     nodes:
       - name: primary
         label: centos-8
@@ -12,7 +12,7 @@
 
 
 - nodeset:
-    name: fedora-latest-2-node
+    name: tobiko-fedora-latest-2-node
     nodes:
       - name: primary
         label: fedora-31
@@ -25,7 +25,7 @@
 
 
 - nodeset:
-    name: ubuntu-focal-2-node
+    name: tobiko-ubuntu-focal-2-node
     nodes:
       - name: primary
         label: ubuntu-focal