qemu-vm: stop the swtpm once qemu stops

The idea is to run an async process waiting for swtpm
and we have to ensure that `FD_CLOEXEC` is cleared on this process'
stdin file descriptor, we use `fdflags` for this, a loadable builtin in
Bash ≥ 5.

The async process when exited will terminate `swtpm`, we bind the
termination of the async process to the termination of QEMU by virtue of
having `qemu` exec in that Bash script.

Signed-off-by: Arthur Gautier <baloo@superbaloo.net>
Co-authored-by: Raito Bezarius <masterancpp@gmail.com>

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