Use dnf module to get rid of warning

Ansible throws a warning on this command;
[WARNING]: Consider using the dnf module rather than running 'dnf'

Change-Id: Icc2aac744837676fe6b48fad44187ef750039d7a

ansible/seed-vm-provision.yml

@@ -16,7 +16,9 @@
     # Until the role handles it, install it using the --allowerasing option
     # which will remove coreutils-single.
     - name: Ensure coreutils package is installed
-      command: "dnf install coreutils -y --allowerasing"
+      dnf:
+        name: coreutils
+        allowerasing: true
       become: True
       when:
         - ansible_facts.os_family == 'RedHat'