Move process-stackviz role from Tempest to Devstack

process-stackviz role currently defined in Tempest repo[1] and used
in tempest jobs. Issue with having it in branchless Tempest is that any
fix in that role cannot be backported to older Tempest. Also stackviz is
not Tempest things it is only used by Tempest jobs.

Stackviz can be considered as a service similar to Tempest so inatlling it in
Devstack side make sense. Also that will give us advantage to handle the
branch specific fixes or backpoting the fixes.

This can solve the current issues we are facing on rocky branch
- https://zuul.opendev.org/t/openstack/build/c1e2da80537448bfb24331fb4198a931/console#4/0/29/controller

[1] https://opendev.org/openstack/tempest/src/branch/master/roles/process-stackviz

Change-Id: I0ba1fd05c6391cd8bb978119ecfbb891def2d497

roles/process-stackviz/README.rst

@@ -0,0 +1,22 @@
+Generate stackviz report.
+
+Generate stackviz report using subunit and dstat data, using
+the stackviz archive embedded in test images.
+
+**Role Variables**
+
+.. zuul:rolevar:: devstack_base_dir
+   :default: /opt/stack
+
+   The devstack base directory.
+
+.. zuul:rolevar:: stage_dir
+   :default: "{{ ansible_user_dir }}"
+
+   The stage directory where the input data can be found and
+   the output will be produced.
+
+.. zuul:rolevar:: zuul_work_dir
+   :default: {{ devstack_base_dir }}/tempest
+
+   Directory to work in. It has to be a fully qualified path.

roles/process-stackviz/defaults/main.yaml

@@ -0,0 +1,3 @@
+devstack_base_dir: /opt/stack
+stage_dir: "{{ ansible_user_dir }}"
+zuul_work_dir: "{{ devstack_base_dir }}/tempest"

roles/process-stackviz/tasks/main.yaml

@@ -0,0 +1,70 @@
+- name: Devstack checks if stackviz archive exists
+  stat:
+    path: "/opt/cache/files/stackviz-latest.tar.gz"
+  register: stackviz_archive
+
+- debug:
+    msg: "Stackviz archive could not be found in /opt/cache/files/stackviz-latest.tar.gz"
+  when: not stackviz_archive.stat.exists
+
+- name: Check if subunit data exists
+  stat:
+    path: "{{ zuul_work_dir }}/testrepository.subunit"
+  register: subunit_input
+
+- debug:
+    msg: "Subunit file could not be found at {{ zuul_work_dir }}/testrepository.subunit"
+  when: not subunit_input.stat.exists
+
+- name: Install stackviz
+  when:
+    - stackviz_archive.stat.exists
+    - subunit_input.stat.exists
+  block:
+    - include_role:
+        name: ensure-pip
+
+    - pip:
+        name: "file://{{ stackviz_archive.stat.path }}"
+        virtualenv: /tmp/stackviz
+        virtualenv_command: '{{ ensure_pip_virtualenv_command }}'
+        extra_args: -U
+
+- name: Deploy stackviz static html+js
+  command: cp -pR /tmp/stackviz/share/stackviz-html {{ stage_dir }}/stackviz
+  when:
+    - stackviz_archive.stat.exists
+    - subunit_input.stat.exists
+
+- name: Check if dstat data exists
+  stat:
+    path: "{{ devstack_base_dir }}/logs/dstat-csv.log"
+  register: dstat_input
+  when:
+    - stackviz_archive.stat.exists
+    - subunit_input.stat.exists
+
+- name: Run stackviz with dstat
+  shell: |
+    cat {{ subunit_input.stat.path }} | \
+      /tmp/stackviz/bin/stackviz-export \
+        --dstat "{{ devstack_base_dir }}/logs/dstat-csv.log" \
+        --env --stdin \
+        {{ stage_dir }}/stackviz/data
+  when:
+    - stackviz_archive.stat.exists
+    - subunit_input.stat.exists
+    - dstat_input.stat.exists
+  failed_when: False
+
+- name: Run stackviz without dstat
+  shell: |
+    cat {{ subunit_input.stat.path }} | \
+      /tmp/stackviz/bin/stackviz-export \
+        --env --stdin \
+        {{ stage_dir }}/stackviz/data
+  when:
+    - stackviz_archive.stat.exists
+    - subunit_input.stat.exists
+    - not dstat_input.stat.exists
+  failed_when: False