clc_server will not give any indication of disk add failures

[ralphmcneal]

Creating a server and adding disk with the attributes below will pass if 0 or all 3 disk are added. Can the failure of adding disk, resulting in an invalid state, be bubbled up?

additional_disks:

• { path: /mnt/data00, sizeGB: "100", type: partitioned }
• { path: /mnt/data01, sizeGB: "100", type: partitioned }
• { path: /mnt/data02, sizeGB: "100", type: partitioned }