openqa/server: only install nfs-utils when needed

If there are no NFS workers, we don't need the NFS server.

Signed-off-by: Adam Williamson <awilliam@redhat.com>

roles/openqa/server/tasks/main.yml

@@ -165,7 +165,6 @@
       - git # for checking out tests/tools
       - jq # for checking if tests changed after template load
       - python3-libsemanage # for using seboolean module
-      - nfs-utils # for configuring/running NFS server
       - perl(Class::DBI::Pg) # for using postgresql DB
       - genisoimage # for building cloud-init ISO
       - policycoreutils # for loading SELinux policy module
@@ -173,6 +172,15 @@
   tags:
   - packages
 
+- name: Install various other required packages
+  package:
+    name:
+      - nfs-utils # for configuring/running NFS server
+    state: present
+  when: "openqa_nfs_workers is defined"
+  tags:
+  - packages
+
 - name: Check test directory exists with correct ownership
   file: path=/var/lib/openqa/share/tests/fedora state=directory owner=geekotest group=geekotest recurse=yes