Artifacts directory path is now set in a variable

The artifact directory where we collect details of
the validations execution from the ansible perspective
is now set as a variable, with the default value
in defaults/main.yaml

Signed-off-by: Jiri Podivin <jpodivin@redhat.com>
Change-Id: I52d0bf261dd8eeeeb2817cd8f833937ef3c7ab93

roles/fetch_validations/defaults/main.yaml

@@ -2,3 +2,4 @@
 src_dir: "{{ zuul.project.src_dir }}"
 output_dir: "{{ ansible_user_dir }}"
 log_path: "{{ zuul.executor.log_root }}"
+artifacts_dir: "{{ zuul.executor.work_root }}/artifacts"

roles/fetch_validations/tasks/main.yaml

@@ -6,7 +6,7 @@
     state: directory
   with_items:
     - "{{ log_path }}/validations-logs"
-    - "{{ zuul.executor.work_root }}/artifacts"
+    - "{{ artifacts_dir }}"
   loop_control:
     loop_var: vf_output_dir