Fix devstack/packstack job permission denied issue

The review fixes permission denied issues while either tempest.conf
is copied to /opt/stack/tempest location or a tempest plugins are
installed there.

Change-Id: I16bbc2faccb31af04867757aa4357d55ee4de572

.zuul.yaml

@@ -120,7 +120,7 @@
       user: admin
       cloud_user: devstack-admin
       plugins_paths:
-        - "~/{{ zuul.projects['opendev.org/openstack/heat-tempest-plugin'].src_dir }}"
+        - "{{ ansible_user_dir }}/{{ zuul.projects['opendev.org/openstack/heat-tempest-plugin'].src_dir }}"
       tempest_concurrency: 2
 
 - job:

roles/generate-tempestconf-file/tasks/main.yaml

@@ -55,6 +55,7 @@
   # tempest role which will run tests has tempest in {{ devstack_base_dir }}
   # location, therefore the file is copied there
   - name: Copy tempest.conf to the tempest directory
+    become: yes
     shell: |
         set -x
         cp {{ tempestconf_src_relative_path }}/etc/tempest.conf {{ devstack_base_dir }}/tempest/etc/tempest.conf

roles/install-plugins/tasks/main.yaml

@@ -1,9 +1,11 @@
 - name: Prepare tempest venv
+  become: yes
   command: tox -r --notest -efull
   args:
     chdir: "{{devstack_base_dir}}/tempest"
 
 - name: Install plugins
+  become: yes
   command: tox -evenv-tempest -- pip install {{ item }}
   with_items: "{{ plugins_paths }}"
   args:
@@ -11,6 +13,7 @@
   when: plugins_paths is defined
 
 - name: List installed tempest plugins
+  become: yes
   command: tox -evenv-tempest -- tempest list-plugins
   args:
     chdir: "{{devstack_base_dir}}/tempest"