Fix sushy_emulator integration in reproducer

It's a followup of openstack-k8s-operators#1753.
We get rid of realpath filter which resolves the path using the
controller's filesystem [1]. When the filesystems don't match between
the controller and the remote machine, we might hit somme issues.
For instance, when running controller on a Fedora CoreOS system,
the '/home' gets resolved as '/var/home' by realpath, leading to
incorrect path in remote machine.
Without 'realpath', we end up with the '..' in the patch which is
a bit uggly but we keep the consistency.

Also, we set the hypervisor ansible user used as the emulator libvirt
user in order to have a more dynamic configuration, otherwise it fails
by default if hypervisor ansible user is not 'zuul' (i.e default user).

[1] https://docs.ansible.com/ansible/latest/collections/ansible/builtin/realpath_filter.html#synopsis

roles/reproducer/tasks/configure_controller.yml

@@ -25,9 +25,10 @@
     cifmw_sushy_emulator_sshkey_path: >-
       {{
         [_ctl_reproducer_basedir, '../.ssh/sushy_emulator-key'] |
-        path_join | realpath
+        path_join
       }}
     cifmw_podman_user_linger: "zuul"
+    cifmw_sushy_emulator_libvirt_user: "{{ hostvars[cifmw_sushy_emulator_hypervisor_target].ansible_user }}"
   block:
     - name: Ensure directories exist
       ansible.builtin.file: