Revert "gen_nodes: ensure kdevops prefix has no dashes"

As reported by Scott Mayhew <[email protected]> this broke
stuff [0] so just remove it.

[0] https://lore.kernel.org/kdevops/Z-r_3KKXyJww7NpN@aion/T/#u

This reverts commit 2b61c99.

Author: mcgrof

playbooks/roles/gen_nodes/tasks/main.yml

@@ -18,11 +18,6 @@
   command: "id -g -n"
   register: my_group
 
-- name: Fail if kdevops_host_prefix contains a dash
-  fail:
-    msg: "Invalid kdevops_host_prefix '{{ kdevops_host_prefix }}'. The prefix cannot contain a dash ('-')."
-  when: kdevops_host_prefix is search("-")
-
 - name: Create guestfs directory
   ansible.builtin.file:
     path: "{{ guestfs_path }}"