admin.yml: two updates - commented out sudo and conditionals
admin.yml: two updates - commented out sudo and conditionals

 - # sudo: yes
  - the remote_user : root can be commented out and sudo: yes can be
    used when the users are added
 - two conditionals added to network and ip_forwarding roles
  - they make sure that these roles only run if the interfaces defined
    actually exist on the machine (if not, this will likely break network
    connectivity on the machine)

CSC-IT-Center-for-Science/fgci-ansible,A1ve5/fgci-ansible,mantti/fgci-tut,mantti/fgci-tut,mantti/fgci-tut