qemu-system-x86_64: -accel kvm:tcg: Don't use ':' with -accel, use -M accel=... for now instead

[Nir Soffer]

We have automated tests running qemu like this:

19:22:55 DEBUG   (MainThread) [qemu] Starting qemu ['qemu-kvm',
'-accel', 'kvm:tcg', '-drive',
'file=/var/tmp/ovirt-imageio-common/test_full_backup_raw_tcp_0/disk.raw,format=raw',
'-nographic', '-qmp',
'unix:/var/tmp/ovirt-imageio-common/test_full_backup_raw_tcp_0/qmp.sock,server,nowait',
'-audiodev', 'none,id=1', '-S']

These tests worked fine for couple of moth and start to fail to day
with this error:
qemu-system-x86_64: -accel kvm:tcg: Don't use ':' with -accel, use -M
accel=... for now instead

Since we use virt-preview repo, we consume now this version:
qemu-4.2.0-0.2.rc2.fc30.src.rpm

These tests run fine with:
qemu-kvm-4.1.0-5.fc30.x86_64

Is this a known issue?

Nir