Remove fedora-30 from the nodepool builders

The launchers have had this label removed and if things look over there
the last step in the nodepool retirement of this image type is to remove
it from the builders.

Change-Id: Ic9e29cfdc6d8a7e2a009f524ecfb0f93b60e3724

nodepool/nodepool.yaml

@@ -23,8 +23,6 @@ providers:
         config-drive: true
       - name: debian-stretch
         config-drive: true
-      - name: fedora-30
-        config-drive: true
       - name: fedora-31
         config-drive: true
       - name: fedora-32
@@ -157,15 +155,6 @@ diskimages:
     env-vars:
       DIB_EPEL_DISABLED: '1'
 
-  - name: fedora-30
-    parent: base
-    pause: false
-    python-path: /usr/bin/python3
-    elements:
-      - fedora-minimal
-      - cache-devstack
-    release: 30
-
   - name: fedora-31
     parent: base
     pause: false