feat: Add conditional to support both autofs, fstab mnts

Closes rc/hpc-factory#175

ansible/group_vars/all

@@ -30,6 +30,7 @@
 # nfs_mounts related
   enable_nfs_mounts: true
   use_autofs: false
+  use_fstab: false
   mount_points:
     - { "src": "master:/gpfs4", "path": "/gpfs4", "opts": "ro,sync,hard", "mode": "0755" }
     - { "src": "master:/gpfs5", "path": "/gpfs5", "opts": "ro,sync,hard", "mode": "0755" }

ansible/roles/nfs_mounts/tasks/main.yml

 ---
 - name: nfs_mounts using fstab
   include_tasks: fstab.yml
-  when: not use_autofs
+  when: use_fstab
 
 - name: nfs_mounts using autofs
   include_tasks: autofs.yml