* Stop requiring memory_mb, local_gb, cpu, cpu_arch, ipmi_address, interfaces;
take them from inventory instead
* Issue a warning when inventory is not supplied
* Raise an error when root device hints are requested but inventory
is not supplied
* Logging improvement around network interfaces handling
Closes-Bug: #1528831
Change-Id: Iaa1c34092463ff216379e30bcef55235517f6c92