fix #147
NOTE: this won't ensure there will no same name qemu. if vm creation will still be remaining in background, this change cannot aware such background process and hence it may try to create new vm with same name. but once the vm creation process is done and vm is visible, cappx can stop creating new vm.
fix #147 NOTE: this won't ensure there will no same name qemu. if vm creation will still be remaining in background, this change cannot aware such background process and hence it may try to create new vm with same name. but once the vm creation process is done and vm is visible, cappx can stop creating new vm.