Remove fedora nodesets

osh-infra still have references to fedora 27 which is quite old now,
this change removes those definitions since they are unused.

Change-Id: I4f127113f0014ec2ed11f21e230facd08820af6e

zuul.d/nodesets.yaml

@@ -57,25 +57,6 @@
           - node-1
           - node-2
 
-- nodeset:
-    name: openstack-helm-fedora
-    nodes:
-      - name: primary
-        label: fedora-27
-      - name: node-1
-        label: fedora-27
-      - name: node-2
-        label: fedora-27
-    groups:
-      - name: primary
-        nodes:
-          - primary
-      - name: nodes
-        nodes:
-          - node-1
-          - node-2
-
-
 - nodeset:
     name: openstack-helm-five-node-ubuntu
     nodes:
@@ -124,30 +105,6 @@
           - node-3
           - node-4
 
-- nodeset:
-    name: openstack-helm-five-node-fedora
-    nodes:
-      - name: primary
-        label: fedora-27
-      - name: node-1
-        label: fedora-27
-      - name: node-2
-        label: fedora-27
-      - name: node-3
-        label: fedora-27
-      - name: node-4
-        label: fedora-27
-    groups:
-      - name: primary
-        nodes:
-          - primary
-      - name: nodes
-        nodes:
-          - node-1
-          - node-2
-          - node-3
-          - node-4
-
 - nodeset:
     name: openstack-helm-single-32GB-node
     nodes: