Describe the bug
When mounting multiple volumes to a unit, brave units displays only the volume that was mounted last

To Reproduce

mkdir testA
touch testA/test.file

mkdir testB
touch testB/test.file

brave base alpine/edge/amd64
brave deploy brave-base-alpine-edge-1.0 --name alpine
brave mount $PWD/testA alpine:/root/testA
brave mount $PWD/testB alpine:/root/testB
brave units

The output will be testB disk information.

Expected behavior
Both testA and testB should be displayed

Environment (please complete the following information):

• Your operating system name and version: Ubuntu 18.04
• Bravetools version: 1.54
• LXD version: 4.6