Merge branch 'nvidia_rmmod' into 'master'

rmmod various nvidia components before attempting an install:

See merge request !182

Former-commit-id: f054c03b

roles/gpu/tasks/main.yml

@@ -90,6 +90,12 @@
     uninstall_driver: true
   when: nvidia_driver.stat.exists and not installed_driver_version.stdout == nvidia_version
 
+- name: Unload nvidia driver
+  shell: rmmod nvidia_uvm nvidia_drm nvidia_modeset nvidia || true
+  sudo: true
+  when: install_driver
+
+
 - name: stop the persistence daemon
   service: name=nvidia-persistenced state=stopped
   become: true