runqemu: Remove potential lock races around tap device handling

The qemu tap device handling is potentially race ridden. We pass the
fd to the main qemu subprocess which is good as it means the lock is held
as long as the qemu process exists. This means we shouldn't unlock it
ourselves though, only close the file. We also can't delete the file
as we have no idea if qemu is still using it. We could try and obtain
an exclusive new lock, then the file would be safe to unlink but it
doesn't seem worth it.

Also fix the same issue in the port lock code.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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