[mounts] Repeated id/gid mappings

[townsend2010]

I'm seeing where repeated uid/gid mappings are occurring and seem to increase with instance stop/start cycles with mounts defined.

$ multipass info test-mount
Name:           test-mount
State:          Running
IPv4:           10.88.239.162
Release:        Ubuntu 22.04 LTS
Image hash:     d90ea6784789 (Ubuntu 22.04 LTS)
Load:           0.01 0.04 0.00
Disk usage:     1.9G out of 4.7G
Memory usage:   253.6M out of 1.9G
Mounts:         /home/townsend => Home
                    UID map: 1000:default, 1000:default, 1000:default, 1000:default, 1000:default, 1000:default, 1000:default, 1000:default
                    GID map: 1000:default, 1000:default, 1000:default, 1000:default, 1000:default, 1000:default, 1000:default, 1000:default
                               => test-mount
                    UID map: 1000:default, 1000:default, 1000:default, 1000:default
                    GID map: 1000:default, 1000:default, 1000:default, 1000:default

Yikes!

[ricab]

FWIW, on quick experimenting, I observed this when stopping and starting the daemon, myself.