Produce separate named report files

Refactor role with tags for execute pre-run, run and
post-run phases.

Change-Id: I7daff63be56d2746a63e00d21aaa78078e60f60f

playbooks/tobiko-devstack-post-run.yaml

@@ -14,9 +14,18 @@
 
 ---
 
+- hosts: tempest
+  roles:
+    - role: tobiko
+      tags:
+        - tobiko-post-run
+      vars:
+        tobiko_pre_run: false
+        tobiko_run: false
+        tobiko_post_run: true
+
+
 - hosts: tempest
   become: true
   roles:
-    - role: fetch-subunit-output
-      zuul_work_dir: '{{ devstack_base_dir }}/tobiko'
     - role: process-stackviz

playbooks/tobiko-devstack-pre-run.yaml

@@ -29,18 +29,20 @@
       become: yes
 
 
-- name: Copy the build ssh key to authorized_keys on all hosts for stack
-  hosts: all
+- hosts: all
   roles:
     - role: copy-build-sshkey
       copy_sshkey_target_user: stack
-
-
-- hosts: all
-  roles:
     - multi-node-setup
-
-
-- hosts: all
-  roles:
     - orchestrate-devstack
+
+
+- hosts: tempest
+  roles:
+    - role: tobiko
+      tags:
+        - tobiko-pre-run
+      vars:
+        tobiko_pre_run: true
+        tobiko_run: false
+        tobiko_post_run: false

playbooks/tobiko-devstack-run.yaml

@@ -14,7 +14,10 @@
 
 ---
 
-- name: Run Tobiko
-  hosts: tempest
+- hosts: tempest
   roles:
     - role: tobiko
+      vars:
+        tobiko_pre_run: false
+        tobiko_run: true
+        tobiko_post_run: false