manila adoption: fix the reference to access a controller

controller_ssh by itself is undefined for the netapp codepath
(it is defined when using the cephfs backend).
But it is not used either in the netapp codepath, so just remove it.

Author: tosky

tests/roles/manila_adoption/tasks/netapp.yaml

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