Disable tempfs mounting on /tmp of Fedoras

There a no-space left error affecting pip packages installation
when using Fedora-32 withing Vagrant

Change-Id: I900656f23f5fd9da448294477a174565b29a9a1e

roles/tests/provision.yaml

@@ -1,7 +1,16 @@
 ---
 
+#TODO: disable mounting /tmp on a tempfs:
+# sudo systemctl mask tmp.mount
+
 - hosts: all
   tasks:
+    - name: 'disable tempfs on Fedora'
+      become: yes
+      command: systemctl mask tmp.mount
+      when: ansible_distribution == 'Fedora'
+      ignore_errors: yes
+
     - name: Register as user '{{ rh_username }}' and auto-subscribe to available content
       become: yes
       redhat_subscription: