kvm-tools: Don't create existed ~/.kvm-tools/ directory

it is created when the progam started(in main.c).

Acked-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>