zuul: Add devstack-plugin-nfs-tempest-slow to exercise more scenario tests

Change-Id: I4cdd2769520b3de94c46dc6f16e54012640d7bc5

.zuul.yaml

@@ -4,12 +4,14 @@
     check:
       jobs:
         - devstack-plugin-nfs-tempest-full
+        - devstack-plugin-nfs-tempest-slow
         - devstack-plugin-nfs-tempest-full-ussuri
         - devstack-plugin-nfs-tempest-full-train
         - devstack-plugin-nfs-tempest-full-stein
     gate:
       jobs:
         - devstack-plugin-nfs-tempest-full
+        - devstack-plugin-nfs-tempest-slow
         - devstack-plugin-nfs-tempest-full-ussuri
         - devstack-plugin-nfs-tempest-full-train
         - devstack-plugin-nfs-tempest-full-stein
@@ -68,6 +70,27 @@
     irrelevant-files: *gate-irrelevant-files
     branches: ^(?!stable/(ocata|pike|queens|rocky|stein|train)).*$
 
+- job:
+    name: devstack-plugin-nfs-tempest-slow
+    parent: tempest-slow-py3
+    description: |
+      tempest-slow-py3 job based on NFS.
+    timeout: 10800
+    required-projects:
+      - opendev.org/openstack/devstack-plugin-nfs
+    host-vars:
+      controller:
+        devstack_plugins:
+          devstack-plugin-nfs: https://opendev.org/openstack/devstack-plugin-nfs
+    vars:
+      devstack_localrc:
+        ENABLE_NFS_CINDER: true
+        ENABLE_VOLUME_MULTIATTACH: false
+    irrelevant-files:
+      - ^(test-|)requirements.txt$
+      - ^setup.cfg$
+    branches: ^(?!stable/(ocata|pike|queens|rocky|stein|train|ussuri)).*$
+
 - job:
     name: devstack-plugin-nfs-tempest-full-ussuri
     parent: devstack-plugin-nfs-tempest-full