This adds handling for a new shutdown policy, namely "migrate".
If that is set then the LRM doesn't queues stop jobs, but transitions
to a new mode, namely 'maintenance'.
The LRM modes now get passed from the CRM in the NodeStatus update
method, this allows to detect such a mode and make node-stat
This is a POC, trying to implement basic loadbalancing
with best fist algorithm using dotproduct heuristic
some docs about dotproduct heuristic:
https://www.thinkmind.org/download.php?articleid=icn_2014_11_10_30065
https://hal.archives-ouvertes.fr/hal-00868016v2/document
The main idea is to order
