Use mkstemp instead of mktemp in ls-hubd

Open-webOS-DCO-1.0-Signed-off-by: Juhani Mesiainen <juhani.mesiainen@palm.com>
Open-webOS-DCO-1.0-Signed-off-by: Keith Derrick <keith.derrick@palm.com>

Change-Id: Ie9ef44bd732c88734c7db0c7f404cc2fc00d2211