Remove broken experimental job

Change I270c0b623aef55bd6bf80b9bf5fdd618e4ced517 removed the job
definition for openstack-ansible-deploy-aio_metal_octavia-opensuse-150,
remove the experimental job now.

The template openstack-ansible-deploy-aio_metal-jobs tests openSUSE, so
no need for this job.

Change-Id: I0431e693efde35e933bf2f7c6bcedec326aac2f7

zuul.d/project.yaml

@@ -22,6 +22,3 @@
       # - openstack-ansible-deploy-aio_distro_metal-jobs
       - publish-openstack-docs-pti
       - release-notes-jobs-python3
-    experimental:
-      jobs:
-        - openstack-ansible-deploy-aio_metal_octavia-opensuse-150