Move ssh-keyscan to zuul pre playbook

As we now need to connect to each host from the controller we need to
ensure from the very beggining that we are able to SSH each node since
start.

ci/playbooks/multinode-customizations.yml

@@ -102,6 +102,19 @@
           - make
         state: present
 
+    - name: Ensure we know compute host keys
+      ansible.builtin.shell:
+        cmd: |
+          ssh-keyscan {{ hostvars[item].ansible_host }} >> ~/.ssh/known_hosts
+      loop: >-
+        {{
+          hostvars | dict2items |
+          selectattr("value.ansible_host", "defined") |
+          map(attribute="key")
+        }}
+      loop_control:
+        label: "{{ item }}"
+
     - name: Generate an ssh keypair
       ansible.builtin.command:
         cmd: ssh-keygen -t ed25519 -f ~/.ssh/id_ed25519 -P ''

ci_framework/hooks/playbooks/fetch_compute_facts.yml

@@ -1,22 +1,4 @@
 ---
-- name: Gather ssh host keys hook
-  hosts: localhost
-  gather_facts: false
-  connection: local
-  tasks:
-    - name: Ensure we know compute host keys
-      ansible.builtin.shell:
-        cmd: |
-          ssh-keyscan {{ hostvars[item].ansible_host }} >> ~/.ssh/known_hosts
-      loop: >-
-        {{
-          hostvars | dict2items |
-          selectattr("value.ansible_host", "defined") |
-          map(attribute="key")
-        }}
-      loop_control:
-        label: "{{ item }}"
-
 - name: Push repositories hook
   hosts: all,!crcs,!crc
   gather_facts: true