Set path for tobiko logs in devstack tobiko jobs

Tobiko should now log its output to '{{ ansible_user_dir }}'
directory thus it will be fetched by Zuul after job ends and
we will be able to check tobiko logs after every CI job run in
Zuul.

Change-Id: I2f6e0edd2878e5a7ffd9697a3eaeea61a4c03674

playbooks/pre-tobiko-devstack.yaml

@@ -27,3 +27,6 @@
         owner: stack
         group: stack
       become: yes
+
+  roles:
+    - setup_tobiko_logs_dir

roles/setup_tobiko_logs_dir/README.rst

@@ -0,0 +1,8 @@
+Configure tobiko logs directory to be accessible for ``stack`` user.
+
+**Role Variables**
+
+.. zuul:rolevar:: tobiko_logsdir
+   :default: /opt/stack/tobiko_logs
+
+   Name of the directory where Tobiko configs will be stored.

roles/setup_tobiko_logs_dir/defaults/main.yml

@@ -0,0 +1 @@
+tobiko_logsdir: "/opt/stack/tobiko_logs"

roles/setup_tobiko_logs_dir/tasks/main.yml

@@ -0,0 +1,8 @@
+- name: Ensure logdir exists
+  become: yes
+  file:
+    path: "{{ tobiko_logsdir }}"
+    state: directory
+    owner: stack
+    group: "{{ ansible_user }}"
+    mode: 0775

zuul.d/tobiko-devstack.yaml

@@ -24,6 +24,7 @@
         # TOBIKO_KEYSTONE_USERNAME: tobiko
         # TOBIKO_KEYSTONE_PASSWORD: secret_tobiko
         # TOBIKO_KEYSTONE_PROJECT_NAME: tobiko
+        TOBIKO_LOG_DIR: '{{ devstack_base_dir }}/tobiko_logs'
       devstack_plugins:
         heat: https://opendev.org/openstack/heat.git
         neutron: https://opendev.org/openstack/neutron.git
@@ -70,9 +71,7 @@
               min_compute_nodes: "{{ groups['compute'] | default(['controller']) | length }}"
       test_results_stage_name: test_results
       zuul_copy_output:
-        '{{ devstack_base_dir }}/tobiko/etc/tobiko.conf': logs
-        '{{ devstack_base_dir }}/tobiko/etc/accounts.yaml': logs
-        '{{ devstack_base_dir }}/tobiko/tobiko.log': logs
+        '{{ devstack_base_dir }}/tobiko_logs': logs
         '{{ stage_dir }}/{{ test_results_stage_name }}.subunit': logs
         '{{ stage_dir }}/{{ test_results_stage_name }}.html': logs
         '{{ stage_dir }}/stackviz': logs