eida_statsman : add interface to manage networks and nodes policy

[jschaeff]

• toggle default policy on a node
  • when an operator tries to change the policy on a node, there is 2 possible behaviours:
  • if default policy is changed to "open", then make sure that all networks is open, show to the operator the list of networks with resulting restriction
  • else, make sure all networks conform to the default policy. Opening networks has to be done manually
• toggle policy on a network
• list policies for networks (optionally filter by node)

[vpet98]

Done at development branch. New commands examples:

• eida_statsman nodes set_group 18 GROUPNAME
• eida_statsman nodes set_policy 18 1 (if set to 1/True all networks of node turn their inverted_policy to 0 to conform with restriction, whereas if set to 0/False all networks of node with inverted_policy = 1 are printed to inform user that they will become restricted)
• eida_statsman networks list -n 18 (-n or --node optional)
• eida_statsman networks set_group 14 Z32015 GROUPNAME
• eida_statsman networks set_policy 14 Z32015 0

I leave the issue open for review.

[jschaeff]

I added some help messages. Seems good to me!