Add one second of sleep after killing QEMU to avoid race condition.
Add one second of sleep after killing QEMU to avoid race condition.

The SSH and VNC ports may still be busy if the kill hasn't had time to
go through (it's usually fast, but not "instant-fast").

bboozzoo/meta-mender,bboozzoo/meta-mender,GregorioDiStefano/meta-mender,bboozzoo/meta-mender,GregorioDiStefano/meta-mender,bboozzoo/meta-mender,GregorioDiStefano/meta-mender