Drop bindep fallback testing on opensuse

We're going to clean up these images entirely as they are based on leap
15.2 which is ancient and little to nothing is reliably using these
nodes.

Change-Id: I7c40f27aeb36eb9e3b4690ad6a943385461ee720

zuul.d/jobs.yaml

@@ -1338,16 +1338,6 @@
       The testing is done for CentOS 7.
     nodeset: centos-7
 
-- job:
-    name: project-config-bindep-fallback-opensuse-15
-    parent: project-config-bindep-fallback
-    description: |
-      Check installation of binary packages for file
-      nodepool/elements/bindep-fallback.txt.
-
-      The testing is done for openSUSE Leap 15.
-    nodeset: opensuse-15
-
 - job:
     name: project-config-bindep-fallback-ubuntu-xenial
     parent: project-config-bindep-fallback

zuul.d/projects.yaml

@@ -3837,7 +3837,6 @@
         - project-config-irc-access
         - project-config-nodepool
         - project-config-bindep-fallback-centos-7
-        - project-config-bindep-fallback-opensuse-15
         - project-config-bindep-fallback-ubuntu-xenial
     gate:
       jobs:
@@ -3858,7 +3857,6 @@
         - project-config-irc-access
         - project-config-nodepool
         - project-config-bindep-fallback-centos-7
-        - project-config-bindep-fallback-opensuse-15
         - project-config-bindep-fallback-ubuntu-xenial
     deploy:
       jobs: