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

Not to be merged until demu gains a syslog facility.

Imported from creedence changeset 4fd6d52b5c09b015f20da820ac41fb6dddd8c01d

Signed-off-by: Jon Ludlam <jonatham.ludlam@citrix.com>
Imported-by: John Else <john.else@citrix.com>