cinder adoption: fix the reference to access a controller

controller_ssh by itself is undefined. But it is not used either,
so just remove it.

Author: tosky

tests/roles/cinder_adoption/tasks/cinder_volume_netapp_nfs.yaml

@@ -4,7 +4,6 @@
       become: true
       ansible.builtin.shell: |
         {{ shell_header }}
-        {{ controller_ssh }}
         CONTROLLER1_SCP="{{ controller1_ssh  | regex_replace('^ssh', 'scp')}}"
         ${CONTROLLER1_SCP}:{{ cinder_tripleo_path }} {{ cinder_conf_path }}
         ${CONTROLLER1_SCP}:{{ cinder_tripleo_nfs_shares_config_path }} {{ cinder_nfs_shares_conf_path }}