Stop building opensuse-15-plain images

Depends-On: https://review.opendev.org/725750
Change-Id: I36efdede5c3feccb90e470590da146c0be406814

nodepool/nl01.openstack.org.yaml

@@ -44,8 +44,6 @@ labels:
     min-ready: 1
   - name: ubuntu-xenial-plain
     min-ready: 1
-  - name: opensuse-15-plain
-    min-ready: 1
   - name: centos-8-plain
     min-ready: 1
 
@@ -85,8 +83,6 @@ providers:
         config-drive: true
       - name: ubuntu-xenial-plain
         config-drive: true
-      - name: opensuse-15-plain
-        config-drive: true
       - name: centos-8-plain
         config-drive: true
     pools:
@@ -163,11 +159,6 @@ providers:
             flavor-name: 'Performance'
             diskimage: ubuntu-xenial-plain
             key-name: infra-root-keys-2018-06-15
-          - name: opensuse-15-plain
-            min-ram: 8192
-            flavor-name: 'Performance'
-            diskimage: opensuse-15-plain
-            key-name: infra-root-keys-2018-06-15
           - name: centos-8-plain
             min-ram: 8192
             flavor-name: 'Performance'
@@ -213,5 +204,4 @@ diskimages:
   - name: ubuntu-xenial
   - name: ubuntu-bionic-plain
   - name: ubuntu-xenial-plain
-  - name: opensuse-15-plain
   - name: centos-8-plain

nodepool/nodepool.yaml

@@ -53,8 +53,6 @@ providers:
         config-drive: true
       - name: opensuse-15
         config-drive: true
-      - name: opensuse-15-plain
-        config-drive: true
       - name: opensuse-tumbleweed
         config-drive: true
       - name: ubuntu-bionic
@@ -363,16 +361,6 @@ diskimages:
       DIB_DISTRIBUTION_MIRROR: 'http://mirror.dfw.rax.openstack.org/ubuntu'
       DIB_DEBIAN_COMPONENTS: 'main,universe'
 
-  - name: opensuse-15-plain
-    parent: base
-    pause: false
-    elements:
-      - opensuse-minimal
-      - cache-devstack
-    release: '15.1'
-    env-vars:
-      DIB_DISTRIBUTION_MIRROR: 'http://mirror.dfw.rax.openstack.org/opensuse'
-
   - name: centos-8-plain
     parent: base
     pause: false