Growing a loop backed btrfs pool fix snap path
Growing a loop backed btrfs pool fix snap path

When lxd is installed via snap, like it happens in Ubuntu 20.04 (focal) the storage is mounted inside the namespace `/run/snapd/ns/lxd.mnt` and the command
`sudo btrfs filesystem resize max /var/snap/lxd/common/lxd/storage-pools/<POOL>/` with `ERROR: not a btrfs filesystem: ....`.

This path should be used instead `/var/snap/lxd/common/mntns/var/snap/lxd/common/lxd/storage-pools/<POOL>/`.

Signed-off-by: Carlos Duelo Serrano <84a516841ba77a5b4648de2cd0dfcb30ea46dbb4@cduelo.com>

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