Added task to list tempest plugins

* In tempest, we install tempest plugins from source or from distro
  but there is no visiability that tempest plugins once installed
  got discovered by tempest itself. Listing tempest plugins will
  help to debug tempest plugin related issues easily.

* Added openstack-tempest-all subpackage to install all the tempest
  plugins. The test runs can be controlled through whitelist-file.

Change-Id: If85e5e8ffe769b29d3cbe25ac23210d935b86d08

tasks/tempest_post_install.yml

@@ -58,6 +58,17 @@
     # don't trigger ANSIBLE0013
     - skip_ansible_lint
 
+- name: List installed tempest plugins
+  shell: |
+    set -e
+    if [ -d {{ tempest_venv_bin }} ]; then
+       . {{ tempest_venv_bin }}/activate
+    fi
+    tempest list-plugins
+  args:
+    executable: /bin/bash
+  when: "debug | bool"
+
 - name: Generate tempest test whitelist
   copy:
     content: |

vars/redhat-7.yml

@@ -18,9 +18,6 @@ tempest_distro_packages:
   - git
 
 tempest_service_distro_packages:
-  - openstack-tempest
+  - openstack-tempest-all
-  - python-tempestconf
   - python-subunit
-  - python-keystone-tests-tempest
-  - python-sahara-tests-tempest
   - subunit-filters