Fixes #2001: IP address resolving using the inventory information

This implementation of global network module to scheduler contains:

- creating of new parameters in the scheduler config (preferred network)
- implementing some new resolving methods and changing of their order (resolv_order)

  Resolving of IP address will be processed in this order :
   * ip - test if a machine is accessible on 'preffered_network'
   * nmblookup - samba query
   * dns - qury on DNS server
   * fqdn
   * hosts
   * netbios
   * first - 'last chance method' - returning the first interface
             having completed info (ip & mac & netmask)

  (this order can be modified in scheduler.ini of course)

- adding the netmask as default complementary info of target (computer)