Stop logging inventory in validate-host

We remove the privileged inventory file copy from validate-host so that
validate-host can be tested more easily. Users should use log-inventory
in their base jobs to get this functionality.

Depends-On: https://review.openstack.org/563789
Change-Id: I8cd1748395abfe868f1716a9b4394850f962d436

roles/validate-host/tasks/main.yaml

@@ -31,9 +31,3 @@
   template:
     dest: "{{ zuul_info_dir }}/zuul-info.{{ inventory_hostname }}.txt"
     src: templates/zuul-info.j2
-
-- name: Copy ansible inventory to logs dir
-  delegate_to: localhost
-  copy:
-    src: "{{ inventory_file }}"
-    dest: "{{ zuul_info_dir }}"