Bug#921967: qemu-guest-agent doen't start

[oliver.edelm...@web.de]

Package: qemu-guest-agent
Version: 1:3.1+dfsg-2+b1

The File /lib/systemd/system/qemu-guest-agent.service has 
ExecStart=/usr/bin/qemu-ga but binary is installed in /usr/sbin,
Local fix: change from ExecStart=/usr/bin/qemu-ga to ExecStart=/usr/bin/qemu-ga