Merge branch '90-network' into 'master'

lustre upgrade role

See merge request hpc-team/ansible_cluster_in_a_box!269

roles/upgrade-lustre/tasks/main.yml

+---
+- name: ensure a list of packages installed
+  yum:
+    name: "{{ packages }}"
+    state: latest
+  vars:
+    packages:
+    - lustre-client
+    - kmod-lustre-client
+  become: true
+  become_user: root
+
+- name: Unconditionally reboot the machine with all defaults
+  reboot:
+  become: true
+  become_user: root