Remove ssh key in base cleanup run.

If the builds ssh key is removed during post run no cleanup
actions can be made on remote hosts by jobs inheriting from
the base job. It also causes problems with ssh keys
not being removed for static nodes when jobs are aborted.

Change-Id: I4e8772e697dbb98e8adfa4f8693c3ff71bf02ba1

playbooks/base-test/cleanup.yaml

@@ -0,0 +1,3 @@
+- hosts: all
+  roles:
+    - remove-build-sshkey

playbooks/base-test/post.yaml

@@ -1,10 +1,3 @@
 - hosts: all
   roles:
     - fetch-output
-
-- hosts: all
-  # NOTE(pabelanger): We ignore_errors for the following tasks as not to fail
-  # successful jobs.
-  ignore_errors: yes
-  roles:
-    - remove-build-sshkey

zuul.yaml

@@ -23,6 +23,7 @@
       main job in production.  Not for general use.
     pre-run: playbooks/base-test/pre.yaml
     post-run: playbooks/base-test/post.yaml
+    cleanup-run: playbooks/base-test/cleanup.yaml
     roles:
       - zuul: opendev.org/zuul/zuul-jobs
     timeout: 1800