Altering a file maintained by a package can lead to unexpected behaviou expecially in
this case where packages are being removed and added.
Instead use `dpkg-divert` to allow us to mock `lxd` to `true` to allow `unminimize` to work
without error and to avoid installing of the `lxd` snap.
`--force` implies that we wish not to fail `rm` even if the file is not present.
This was not our intention and as such can be removed.
Also use short option `-v` for verbose output as per the test of the code base.
The unminimize script will try to install the lxd snap using the shim script
`/usr/sbin/lxd` from the lxd-installer package.
Previously `unminimize` was using `snap`
to install `lxd` directly which was being diverted by diverting the `snap` command.
This is no longer the case so we can remove `/usr/sbin/lxd` from the lxd-installer package
if it exists and then redirect any calls to `/usr/sbin/lxd` to `/bin/true`.
