Drop devstack-platform-opensuse-tumbleweed

Builds of opensuse-tumbleweed nodes are currently failing, so these jobs
are receiving NODE_FAILURE.

Change-Id: I3c2d73a150df009e7dadc76277be36eb72e0dfa7

.zuul.yaml

@@ -38,16 +38,6 @@
         nodes:
           - controller
 
-- nodeset:
-    name: devstack-single-node-opensuse-tumbleweed
-    nodes:
-      - name: controller
-        label: opensuse-tumbleweed
-    groups:
-      - name: tempest
-        nodes:
-          - controller
-
 - nodeset:
     name: devstack-single-node-fedora-latest
     nodes:
@@ -424,13 +414,6 @@
     nodeset: devstack-single-node-opensuse-150
     voting: false
 
-- job:
-    name: devstack-platform-opensuse-tumbleweed
-    parent: tempest-full
-    description: openSUSE Tumbleweed platform test
-    nodeset: devstack-single-node-opensuse-tumbleweed
-    voting: false
-
 - job:
     name: devstack-platform-fedora-latest
     parent: tempest-full
@@ -513,7 +496,6 @@
             voting: false
         - devstack-platform-centos-7
         - devstack-platform-opensuse-150
-        - devstack-platform-opensuse-tumbleweed
         - devstack-platform-fedora-latest
         - devstack-multinode
         - devstack-unit-tests