qmp: Add example usage of strto*l() qemu wrapper Signed-off-by: Carlos L. Torres <carlos.torres@rackspace.com> Message-Id: <11ac63e95d88551f1c2c9b1216b15d3cb8ba4468.1437346779.git.carlos.torres@rackspace.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>