cros_vm_lib: drop old qemu support

Ubuntu Trusty ships with qemu-2.0.0 now, so no need to support really
old versions anymore.

BUG=None
TEST=`./bin/cros_start_vm` still works

Change-Id: I1c930d07db630273d54bea6e1f2ce79db689d322
Reviewed-on: https://chromium-review.googlesource.com/392186
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed