CI: clean up non-votings jobs

The DHCP scenario is not OS-dependent, so no point in repeating it
for every OS, let's only leave the main two.

The openSUSE dibipa job is broken, removing it until somebody picks
it up (it has debootstrap version incompatibility).

Change-Id: I7e822d3cfb72a453091bc0436be52c1e83559ecc

zuul.d/bifrost-jobs.yaml

@@ -50,16 +50,6 @@
     parent: bifrost-integration-dhcp
     nodeset: centos-8
 
-- job:
-    name: bifrost-integration-dhcp-opensuse-15
-    parent: bifrost-integration-dhcp
-    nodeset: opensuse-15
-
-- job:
-    name: bifrost-integration-dhcp-debian-buster
-    parent: bifrost-integration-dhcp
-    nodeset: debian-buster
-
 - job:
     name: bifrost-integration-dibipa-debian
     parent: bifrost-integration
@@ -77,11 +67,6 @@
     parent: bifrost-integration-dibipa-debian
     nodeset: centos-8
 
-- job:
-    name: bifrost-integration-dibipa-debian-opensuse-15
-    parent: bifrost-integration-dibipa-debian
-    nodeset: opensuse-15
-
 - job:
     name: bifrost-integration-tinyipa
     parent: bifrost-base

zuul.d/project.yaml

@@ -22,18 +22,12 @@
             voting: false
         - bifrost-integration-dhcp-ubuntu-bionic:
             voting: false
-        - bifrost-integration-dibipa-debian-ubuntu-bionic:
-            voting: false
         - bifrost-integration-dhcp-centos-8:
             voting: false
+        - bifrost-integration-dibipa-debian-ubuntu-bionic:
+            voting: false
         - bifrost-integration-dibipa-debian-centos-8:
             voting: false
-        - bifrost-integration-dhcp-opensuse-15:
-           voting: false
-        - bifrost-integration-dibipa-debian-opensuse-15:
-           voting: false
-        - bifrost-integration-dhcp-debian-buster:
-           voting: false
         - bifrost-cli-ubuntu-bionic:
            voting: false
     gate: