Add support for tempest plugins

This patch allows installation of tempest plugins
by using "refstack_tempest_plugins" parameter.

Change-Id: Ibb0c5381b0f63e9663ecc84f3d24a448450e2b38

infrared_plugin/plugin.spec

@@ -89,3 +89,9 @@ subparsers:
             type: Value
             help: |
               A path or a link to a cirros image.
+          refstack_tempest_plugins:
+            type: KeyValueList
+            help: |
+              Openstack services names with branch or tag for installing the
+              tempest plugins that associated with them.
+              Usage: --refstack_tempest_plugins manila:1.3.0,cinder:master

tasks/install-refstack-client.yaml

@@ -25,6 +25,27 @@
     python3_param: "-p 3"
   when: python3_is_available.rc == 0
 
+- when: refstack_tempest_plugins is defined
+  block:
+    # refstack-client allows installation of additional packages to find more
+    # tests by tempest. The additional tempest plugins should be defined in
+    # "tempest-additional-requirements.txt" file. This block enables this
+    # option by using "refstack_tempest_plugins" parameter.
+    # Usage:
+    #    refstack_tempest_plugins:               ===>    refstack_tempest_plugins:
+    #       <tempest_plugin_name>:<tag/branch>   ===>       manila:1.3.0
+    - name: Add additional requirements for external test suites
+      replace:
+        path: "{{ refstack_client_source }}/setup_env"
+        regexp: '#(.*tempest-additional-requirements.txt$)'
+        replace: '\1'
+
+    - name: Add tempest plugins to tempest-additional-requirements.txt
+      lineinfile:
+        path: "{{ refstack_client_source }}/tempest-additional-requirements.txt"
+        line: "git+https://opendev.org/openstack/{{ item.key }}-tempest-plugin.git@{{ item.value }}"
+      with_dict: "{{ refstack_tempest_plugins }}"
+
 - name: Install refstack-client
   shell: >
     ./setup_env {{ python3_param | default('') }}