CA-138303: Don't ask fe to syslog for qemu/demu.

Not to be merged until demu gains a syslog facility.

Signed-off-by: Jon Ludlam <jonathan.ludlam@citrix.com>
Merge pull request #1806 from jonludlam/qemu-fe-syslog

CA-138303: Don't ask fe to syslog for qemu/demu.