Replace tox_envlist 'all-plugin' with 'all'

The tox envlist 'all-plugin' is deprecated in tempest

Change-Id: I6182926db0c314338c03ed02b1d2f28b057f0eb3

.zuul.yaml

@@ -16,7 +16,7 @@
       - ^doc/.*$
       - ^api-ref/.*$
     vars: &base_vars
-      tox_envlist: all-plugin
+      tox_envlist: all
       tempest_test_regex: zun_tempest_plugin.tests.tempest.api
       devstack_localrc:
         ZUN_USE_UWSGI: true
@@ -40,6 +40,8 @@
         kuryr-libnetwork: https://opendev.org/openstack/kuryr-libnetwork
         devstack-plugin-container: https://opendev.org/openstack/devstack-plugin-container
         zun-tempest-plugin: https://opendev.org/openstack/zun-tempest-plugin
+      tempest_plugins:
+        - zun-tempest-plugin
     post-run: playbooks/zun-tempest-base/post.yaml
 
 - job: